Skip to content
Toggle "Research" dropdown Toggle "Courses" dropdown
Conference on Topological Methods and Invariants of Curves and Surfaces, University of Bayreuth , Germany, July 20–24, 2026.
Workshop Arrangements in Osaka 2025, Osaka University , Japan, December 15–19, 2025.
Conference Geometry-VB80 , IMAR , Bucharest, Romania, October 1–2, 2025.
On some algebraic and geometric invariants associated with matroids Moduli, Hilbert Schemes, and Singularities , Babeș-Bolyai University , Cluj-Napoca, Romania, September 8–12, 2025.Twisted characteristic varieties Topology of arrangements with an eye to applications, University of Pisa , Italy, September 1–5, 2025.An introduction to hyperplane arrangements: Topology and Geometry Hyperplane Arrangements and Related Topics , Tongji University , Shanghai, China, August 11–15, 2025. [Lecture 1 Lecture 2 Lecture 3 Lecture 4 Lower central series and Alexander invariants in group extensions Discrete Groups in Topology and Algebraic Geometry , University of Notre Dame , June 16–20, 2025. [slides Polyhedral products, duality properties, and resonance varieties Geometry and Topology of Polyhedral Complexes , The Ohio State University , May 26–30, 2025. [slides Sigma-invariants and twisted jump loci Groups and Geometry , Alfréd Rényi Institute of Mathematics , Budapest, Hungary, April 6–11, 2025.
On the topology of the Milnor fibration of a complex hyperplane arrangement Joint Meeting of the NZMS, AustMS, and AMS , Auckland, New Zealand, December 9–13, 2024. [slides On some algebraic and geometric invariants associated to matroids Joint Meeting of the NZMS, AustMS, and AMS , Auckland, New Zealand, December 9–13, 2024. [slides The resonance schemes of simplicial complexes Workshop on Polyhedral Products , Fields Institute , Toronto, July 29–August 2, 2024. [slides Topology and combinatorics of decomposable arrangements Arrangements, matroids and logarithmic vector fields , Mathematisches Forshungsinstitut , Oberwolfach, Germany, June 16–21, 2024. [slides Cohomology jump loci in geometry and topology (4 lectures)Hodge theory and cohomological jump loci , Stockholm University and KTH , Sweden, May 27–31, 2024. [talk 1 talk 2 talk 3 talk 4 The Milnor fibrations of hyperplane arrangements Algebraic Geometry Seminar , Humboldt University Berlin , Germany, May 22, 2024. [slides Artin kernels and Milnor fibrations of arrangements Artin groups and arrangements: topology, geometry, and combinatorics , SLMath , Berkeley, CA, March 11–15, 2024. [abstract slides video On the geometry and topology of polynomials Representation Theory and Related Topics Seminar , Northeastern University, February 23, 2024. [announcement slides
On the topology and combinatorics of decomposable arrangements Osaka University , December 20, 2023. [announcement slides Hyperplane arrangements with trivial algebraic monodromy Hyperplane Arrangements 2023 , Rykkio University, Tokyo, Japan, December 11–15, 2023. [slides Resonance schemes of simplicial complexes GASC Seminar , Northeastern University, September 11, 2023. [slides Lower central series and Alexander invariants in group extension sModuli and Friends Seminar , IMAR , Bucharest, Romania, July 26, 2023. [slides Conference on Geometry, Topology and Algebra of Singular Spaces , IMAR , Bucharest, Romania, July 7–11, 2023.Towards an integral version of rational homotopy theory The Tenth Congress of Romanian Mathematicians , Pitești, Romania, July 1, 2023. [slides Topology of hyperplane arrangements Research School on Singularities and Applications , University of Lille , France, June 23, 2023. [extended abstract slides The work of Enrique Artal Bartolo on the topology of singularities Algebraic and topological interplay of algebraic varieties , Jaca, Spain, June 14, 2023. [slides Resonance schemes, Koszul modules, and Hilbert series Topology Seminar , Institute of Mathematics of the Romanian Academy , Bucharest, Romania, May 26, 2023. [announcement slides Poincaré duality algebras and resonance varieties Maurice Auslander International Conference , Woods Hole, MA, April 27, 2023. [slides Resonance schemes and Hilbert series for Koszul modules MIT-Harvard-MSR Combinatorics Seminar , Harvard University , April 26, 2023. [announcement slides Tropical bounds for the Bieri-Neumann-Strebel-Renz invariants Geometric Group Theory and Topology Seminar , Tufts University , April 11, 2023. [slides Algebra and topology of group extensions Algebra and Topology Seminar , University of Strasbourg , France, March 28, 2023. [slides Tropical bounds for the BNSR invariants Algebraic Topology Seminar , UC Louvain , Belgium, March 22, 2023. [slides Lie algebras associated to hyperplane arrangements Various guises of reflection arrangements , International Centre for Mathematical Sciences , Edinburgh, UK, March 14, 2023. [slides Poincaré duality and resonance Pure Math Seminar , University of New South Wales Sydney , Australia, February 23, 2023. [announcement slides Topological invariants of groups and tropical geometry Recent Progress in Mathematics and Statistics Seminar , University of Sydney , Australia, February 9, 2023. [announcement slides
Cohomology jump loci, Poincaré duality, and Pfaffians Pfaffians, tensors, and applications , Max Planck Institute for Mathematics in the Sciences , Leipzig, Germany, November 30, 2022. [slides Polyhedral products, duality properties, and cohomology jump loci Discrete Geometry and Topological Combinatorics Seminar , Freie University Berlin , Germany, November 25, 2022. [slides Topological invariants of groups and tropical geometry Algebraic Geometry Seminar , Humboldt University Berlin , Germany, November 23, 2022. [slides Resonance varieties of differential graded algebras Resonance, topological invariants of groups, moduli , Humboldt University Berlin , Germany, November 18, 2022. [slides Cohomology, Bocksteins, and resonance Topology Seminar , Northeastern University, Boston, MA, September 27, 2022.Arrangements and lower central series Arrangements in Ticino , Università della Svizzera italiana , July 1, 2022. [slides Alexander invariants of commutative differential graded algebras Institute of Mathematics of the Romanian Academy , Bucharest, Romania, April 7, 2022. Cohomology jump loci of 3-dimensional manifolds Colloquium , Institute of Mathematics of the Romanian Academy , Bucharest, Romania, April 6, 2022. [announcement slides Arrangements, duality, and local systems Braids in symplectic and algebraic geometry , at ICERM , Brown University, Providence, RI, March 24, 2022. [slides Cohomology jump loci of 3-dimensional manifolds Topology Seminar , University of Michigan , February 24, 2022. [slides Alexander invariants of algebraic models for spaces Graduate/Postdoc Topology and Singularities Seminar , University of Wisconsin-Madison , February 7, 2022.
Braids, configurations, and polynomials Math Club , Northeastern University, December 3, 2021. [flyer Braids and line arrangements—old and new Conference on Braids, Links, and Applications , Institute of the Mathematical Sciences of the Americas , University of Miami , November 15, 2021. [slides Braids and configuration spaces Playing with Braids , Institute of the Mathematical Sciences of the Americas , University of Miami , November 14, 2021. [slides Duality, finiteness, and cohomology jump loci [slides The work of Alexandru Dimca in algebra, geometry, and topology [slides Conference in Algebraic Geometry for Alexandru Dimca’s retirement , Ischia, Italy, October 11–14, 2021.On the topology of Milnor fibrations of hyperplane arrangements TIBĂR60 Conference , University of Wisconsin-Madison , September 11, 2021. [video slides Algebra and topology of group extensions. Part II. Topology Seminar , Institute of Mathematics of the Romanian Academy , Bucharest, Romania, July 2, 2021. [slides Algebra and topology of group extensions. Part I. Topology Seminar , Institute of Mathematics of the Romanian Academy , Bucharest, Romania, June 25, 2021. [slides Tropical upper bounds for the BNSR invariants Topology Seminar , Institute of Mathematics of the Romanian Academy , Bucharest, Romania, May 21, 2021. [slides Finiteness properties, cohomology jump loci, and tropical varieties Topology Seminar , Northeastern University, Boston, MA, April 13, 2021. [announcement slides Ab-exact extensions and Milnor fibrations of arrangements Graduate/Postdoc Topology and Singularities Seminar , University of Wisconsin-Madison , February 15, 2021. [slides Milnor fibrations of arrangements with trivial algebraic monodromy Workshop on Logarithmic Vector Fields and Freeness of Divisors and Arrangements , Mathematisches Forshungsinstitut , Oberwolfach, Germany, January 24-30, 2021. [slides
Sigma-invariants and tropical geometry Online Geometry and Combinatorics Seminar , University of Western Ontario , London, ON, Canada, September 28, 2020. [slides Poincaré duality and cohomology jump loci Online Algebraic Geometry Seminar , Humboldt University , Berlin, Germany, July 15, 2020. [slides Workshop on Geometry, Combinatorics and Representation Theory , Soochow University , Suzhou, China, July 6-9, 2020. [Cancelled due to COVID-19] Summer School and Workshop on Arrangements , University of Fribourg , Switzerland, June 25-July 3, 2020. [Cancelled due to COVID-19] Workshop on Configuration Spaces of Graphs , American Institute of Mathematics, San Jose, CA, February 3-7, 2020.Finiteness and formality obstructions Workshop on Polyhedral Products in Homotopy Theory , The Fields Institute, Toronto, ON, January 21, 2020. [slides
Sigma-invariants, cohomology jump loci, and tropicalization Hyperplane Arrangements and Singularities , University of Tokyo , Japan, December 2, 2019. [slides Poincaré duality and resonance varieties GASC Seminar , Northeastern University, November 25, 2019. [slides BNSR-invariants and tropical varieties Special Session on Geometry and Topology of Singularities , AMS Fall Central Sectional Meeting, University of Wisconsin, Madison, WI, September 14, 2019. [slides Cohomology jump loci in geometry and topology Donu Arapura’s 60th Birthday Conference , University of Wisconsin , Madison, WI, September 12, 2019. [slides Germs of representation varieties and cohomology jump loci Conference on Non-Isolated Singularities and Derived Geometry , UNAM-Cuernavaca, Mexico, August 1, 2019. [slides Duality, finiteness, and cohomology jump loci Colloquium , University of Notre Dame , April 5, 2019. [poster slides Arrangement groups, lower central series, and Massey products Workshop at the CIMPA Research School on Hyperplane Arrangements , Institute of Mathematics , Vietnam Academy of Science and Technology, Hanoi, Vietnam, March 22, 2019. [slides Topology and combinatorics of hyperplane arrangements Colloquium , University of Nevada at Reno , February 22, 2019. [slides Braids, hyperplane arrangements, and Milnor fibrations Workshop on Braids, Resolvent Degree and Hilbert’s 13th Problem , Institute for Pure and Applied Mathematics , UCLA, Los Angeles, CA, February 21, 2019. [video slides
On the topology of complex line arrangements Conference on Knotted Surfaces in 4-Manifolds , University of Massachusetts Amherst , October 27, 2018.Geometry and topology of cohomology jump loci (3 lectures)Summer School: New Trends in Topology and Geometry , Mediterranean Institute for the Mathematical Sciences , Tunis, Tunisia, July 9-12, 2018. [lecture 1 lecture 2 lecture 3 Cohomology jump loci and duality properties Topology Seminar , Institute of Mathematics of the Romanian Academy , Bucharest, Romania, June 1, 2018. [slides The work of Stefan Papadima in topology and geometry Topology and Geometry: A conference in memory of Stefan Papadima , Institute of Mathematics of the Romanian Academy , Bucharest, Romania, May 28, 2018. [slides Duality and cohomology jump loci University of Western Ontario , London, ON, Canada, May 21, 2018. [slides Abelian duality spaces Special Session on Algebraic, Geometric and Topological Methods in Combinatorics , AMS Spring Eastern Sectional Meeting, Northeastern University, Boston, MA, April 21, 2018. [slides Algebraic models, duality, and resonance Topology Seminar , MIT , March 5, 2018. [slides
Duality and resonance Topology Seminar , University of Rochester , Rochester, NY, November 8, 2017. [announcement ] [slides Geometric and homological finiteness properties Interactions between low-dimensional topology and complex algebraic geometry , Mathematisches Forshungsinstitut , Oberwolfach, Germany, October 27, 2017. [slides Algebraic models, cohomology jump loci, and finiteness properties University of California, Berkeley , Berkeley, CA, October 11, 2017. [slides A quick introduction to cohomology jump loci University of California, Berkeley , Berkeley, CA, October 11, 2017. [announcement ] [slides Poincaré duality, abelian duality, and resonance San Francisco State University , San Francisco, CA, October 6, 2017. [announcement ] [slides Resonance varieties for matroids Matroids in Boston , Northeastern University, Boston, MA, September 13, 2017 Polyhedral products, duality properties, and Cohen-Macaulay complexes Mathematical Congress of the Americas , Montréal, Canada, July 28, 2017. [slides Arrangement complements and Milnor fibrations Mathematical Congress of the Americas , Montréal, Canada, July 25, 2017. [slides Formality notions for spaces and groups Nilpotent Fundamental Groups , Banff International Research Station , Alberta, Canada, June 22, 2017. [slides video Duality and resonance University of Bremen , Germany, June 13, 2017. [slides Resonance varieties ET’nA 2017: Encounter in Topology and Algebra , Scuola Superiore di Catania , Italy, May 31, 2017. [slides Algebraic invariants of pure braid-like groups Braids in Algebra, Geometry, and Topology , International Centre for Mathematical Sciences , Edinburgh, UK, May 23, 2017. [slides Representation varieties and polyhedral products Special Session on Representation Spaces and Toric Topology , AMS Spring Eastern Sectional Meeting, Hunter College, CUNY, New York, NY, May 6, 2017 [slides Representation varieties and cohomology jump loci Singularities in the Midwest, IV , University of Wisconsin , March 17, 2017. [slides
On the topology of line arrangements Hyperplane Arrangements , at Hokkaido University , Sapporo, Japan, August 8-12, 2016. [slides The pure braid groups and their relatives Topology Seminar , Mathematics Institute of the Romanian Academy , Bucharest, Romania, June 17, 2016. [slides An introduction to resonance varieties (2 lectures)Doctoral School and Workshop on Topology and Geometry of Arrangements , University of Fribourg , Switzerland, June 8, 2016. Fundamental groups in algebraic geometry and three-dimensional topology University of Fribourg , Switzerland, June 7, 2016. [announcement poster slides Residual finiteness properties of fundamental groups Number Theory and Algebraic Geometry Seminar , KU Leuven , Belgium, May 18, 2016. [abstract slides Fundamental groups in complex geometry and 3-dimensional topology Brandeis University , March 29, 2016. [abstract slides Algebraic models for Sasakian manifolds and weighted-homogeneous surface singularities Workshop on Singularities and Topology , at Université de Nice , France, March 7-9, 2016. [abstract slides The pure braid groups and their relatives Algebra and Geometry Seminar , University of Caen , France, January 5, 2016. [slides
Complex geometry and 3-dimensional topology Geometric Group Theory and Geometric Topology , at the University of Virginia , Charlottesville, VA, October 17, 2015. [slides Group actions on manifolds and formality properties 30th British Topology Meeting , at Queen’s University Belfast , Belfast, Northern Ireland, UK, September 8, 2015. Sigma-invariants and tropical varieties Finiteness Conditions in Topology and Algebra , at Queen’s University Belfast , Belfast, Northern Ireland, UK, September 1, 2015. [slides Hyperplane arrangements: at the crossroads of topology and combinatorics University of Regina , Saskatchewan, Canada, August 14, 2015. [announcement slides Hyperplane arrangements: Cohomology jump loci and Milnor fibrations Computational Geometric Topology in Arrangement Theory , at ICERM , Brown University, Providence, RI, July 6-10, 2015. Talk 1: [slides video slides video Topology of complex arrangements The Eighth Congress of Romanian Mathematicians , Iași, Romania, June 30, 2015 [slides Deconstructing formality Mathematics Institute of the Romanian Academy , Bucharest, Romania, June 19, 2015 [abstract Hyperplane arrangements and Milnor fibrations University of Western Ontario , London, ON, Canada, June 1, 2015 [slides Resonance, representations, and the Johnson filtration Geometry/Topology Seminar , University of Chicago, May 8, 2015 [slides Geometry and topology of cohomology jump loci (8 lectures)University of Chicago , April 20-May 8, 2015.Algebraic models and the Tangent Cone theorem Representation Theory and Related Topics Seminar , Northeastern University, April 10, 2015. [slides Fundamental groups in topology and geometry Algebraic models and cohomology jump loci Algebraic Topology, Geometric and Combinatorial Group Theory , at the Centro di Ricerca Matematica Ennio De Giorgi , Pisa, Italy, February 24, 2015 [announcement slides
Topology of line arrangements Configuration Spaces–Geometry, Topology and Representation Theory , Palazzone di Cortona , Italy, September 1, 2014 [s lides Combinatorial covers, abelian duality, and propagation of resonance Topology of Torus Actions and Applications to Geometry and Combinatorics , Korea Advanced Institute of Science and Technology , Daejeon, Korea, August 7, 2014 [video slides Complex geometry and three-dimensional topology Algebra and Geometry Seminar , University of Caen , France, June 17, 2014. [slides Hyperplane arrangements, Milnor fibrations, and boundary manifolds Université de Nice , France, June 10, 2014. [slides Combinatorial covers, abelian duality, and propagation of resonance Università di Pisa , Italy, May 29, 2014. [slides Topology of hyperplane arrangements Università di Pisa , Italy, May 28, 2014. [slides Milnor fibrations of hyperplane arrangements Hyperplane Arrangements, Wonderful Compactifications, and Tropicalization , Banff International Research Station , Alberta, Canada, April 20, 2014. [slides Homological finiteness in the Johnson filtration Yale University , February 4, 2014. [slides Abelian duality and propagation of resonance Special Session on Hyperplane Arrangements and Applications , Joint Mathematics Meetings , Baltimore, MD, January 14, 2014 [abstract slides
Milnor fibrations of hyperplane arrangements Hokkaido University , Sapporo, Japan, November 22, 2013. [slides Topology and combinatorics of Milnor fibrations of hyperplane arrangements Hyperplane Arrangements and Characteristic Classes , Research Institute for Mathematical Sciences , Kyoto, Japan, November 13, 2013 [slides Complex geometry and low-dimensional topology Max Planck Institute for Mathematics , Bonn, Germany, October 28, 2013. [abstract slides Hyperplane arrangements: at the crossroads of topology and combinatorics Goethe University Frankfurt , Germany, October 25, 2013 [slides Milnor fibrations of hyperplane arrangements University of Bremen , Germany, October 22, 2013 [slides Topology and geometry of cohomology jump loci Experimental and Theoretical Methods in Algebra, Geometry and Topology , Eforie Nord, Romania, June 24, 2013 [slides Milnor fibrations of hyperplane arrangements Mathematics Institute of the Romanian Academy , Bucharest, Romania, June 14, 2013 [announcement slides Automorphism groups, Lie algebras, and resonance varieties University of Western Ontario , London, ON, Canada, April 25, 2013 [slides Multinets, parallel connections, and Milnor fibrations of arrangements Special Session on Singular Spaces in Geometry, Topology, and Algebra , AMS Spring Western Sectional Meeting , Boulder, CO, April 14, 2013 [abstract slides
Complex geometry and 3-dimensional topology Geometry and Topology , University of Sydney , December 10, 2012 [abstract slides The rational homology of smooth real toric varieties Geometry Topology and Analysis Seminar , University of Sydney , November 26, 2012 [abstract slides The rational homology of real toric manifolds Cohomology Rings and Fundamental Groups of Hyperplane Arrangements, Wonderful Compactifications, and Real Toric Varieties , Mathematisches Forshungsinstitut , Oberwolfach, Germany, October 5, 2012 [extended abstract Resonance varieties Cohomology Rings and Fundamental Groups of Hyperplane Arrangements, Wonderful Compactifications, and Real Toric Varieties , Mathematisches Forshungsinstitut , Oberwolfach, Germany, October 2, 2012 [extended abstract Resonance and representations GASC Seminar , Northeastern University , September 17, 2012 [abstract Moment-angle complexes, toric manifolds, and twisted cohomology Mathematics Institute of the Romanian Academy , Bucharest, Romania, June 22, 2012 [slides Topology of Milnor fibrations of hyperplane arrangements (3 lectures)School and Workshop on Hyperplane Arrangements and Related Topics , University of Pau , Pau, France, June 11-15, 2012Green-Lazarsfeld sets and the topology of smooth algebraic varieties Singularities of Differential Equations in Algebraic Geometry , Centre International de Rencontres Mathématiques , Luminy, France, June 8, 2012 [slides The rational cohomology of smooth, real toric varieties Arrangements and Configuration Spaces , University of Bremen , Bremen, Germany, May 25, 2012 [slides Fundamental groups and cohomology jumping loci Geometric Topology Seminar , Max Planck Institute for Mathematics , Bonn, Germany, May 7, 2012 [abstract Polyhedral products, quasi-toric manifolds, and twisted cohomology Princeton–Rider workshop on Homotopy Theory and Toric Spaces , Princeton University , February 23, 2012 [abstract slides Sigma invariants of hyperplane arrangements Colby-Bates-Bowdoin Collaborative Conference on Geometry, Topology, and Group Theory , Bates College , Lewiston, ME, January 10, 2012Geometric and homological finiteness in free abelian covers Special Session on Geometric Invariants of Groups and Related Topics , Joint Mathematics Meetings , Boston, MA, January 7, 2012 [abstract slides
The rational cohomology of real quasi-toric manifolds Conference on Toric Methods in Homotopy Theory , Queen’s University Belfast , Northern Ireland, UK, July 20, 2011 [slides
Homological finiteness in the Andreadakis-Johnson filtration Algebra and Geometry Seminar , University of Caen , June 21, 2011. [slides The algebra and topology of partial products of circles Groups and Braids Seminar , University of Caen , June 8, 2011 [slides Abelian Galois covers and rank one local systems Topology of Algebraic Varieties , Université de Nice , France, May 25, 2011 [slides Betti numbers of abelian covers Geometry and Topology Seminar , University of Wisconsin , May 6, 2011 [abstract slides On the Johnson filtration of the automorphism group of a free group U. Mass Boston , March 30, 2011 [abstract slides Betti numbers of abelian covers
Dwyer-Fried invariants The Worldwide Center of Mathematics , Cambridge, MA, July 9, 2010 [poster video Free abelian covers and arrangements of Schubert varieties Workshop on combinatorial and geometric aspects of Hyperplane Arrangements , Centro di Ricerca Matematica Ennio De Giorgi , Pisa, Italy, May 25, 2010 [abstract slides Cohomology jumping loci and homological finiteness properties Intensive research period on Configuration Spaces: Geometry, Combinatorics and Topology , Centro di Ricerca Matematica Ennio De Giorgi , Pisa, Italy, May 10-14, 2010 [lecture 1 lecture 2 lecture 3 Topological methods in geometry, algebra, singularities, and combinatorics Homological finiteness and the incidence correspondence GASC Seminar , Northeastern University, February 22, 2010 [abstract
Geometry and topology of cohomology jumping loci University at Albany , December 4, 2009 [announcement slides How to compute the homology of the Milnor fibre of a non-isolated weighted homogeneous singularity University of Warwick , United Kingdom, November 23, 2009Cohomology jump loci, Sigma-invariants, and fundamental groups of algebraic varieties University of Oxford , United Kingdom, November 16, 2009 [announcement slides The Alexander polynomial and its friends Geometry and Topology Seminar , University of Warwick , United Kingdom, November 5, 2009 [abstract Fundamental groups of smooth, (quasi-) projective varieties University of Warwick , United Kingdom, November 4, 2009Algebra and topology of right-angled Artin groups Algebra Seminar , University of Leeds , United Kingdom, October 19, 2009 [slides Partial products of circles Algebra and Geometry Seminar , VU University Amsterdam , The Netherlands, October 13, 2009 [slides Fundamental groups and cohomology support loci University of Liverpool , United Kingdom, October 2, 2009 [slides On the geometry and topology of cohomology jump loci MSJ Seasonal Institute on Arrangements of Hyperplanes , Hokkaido University , Sapporo, Japan, August 9, 2009 [slides Characteristic varieties and homological finiteness properties LIB60BER – Topology of Algebraic Varieties , Jaca, Spain, June 24, 2009 [abstract slides Jump loci and homological finiteness properties Workshop on Fundamental Groups in Algebraic Geometry , Université de Nice , France, May 26, 2009Introduction to toric topology (with Alvise Trevisan )A look at polyhedral products Special Session on Topological Robotics , AMS Spring Eastern Section Meeting , Worcester, MA, April 24, 2009 [abstract
Geometry and topology of cohomology jumping loci Topology Seminar , CUNY Graduate Center , November 20, 2008Finiteness properties of groups and homology jumping loci GASC Seminar , Northeastern University, October 27, 2008 [abstract Bieri-Neumann-Strebel-Renz invariants and homology jumping loci Special Session on Low-Dimensional Topology , AMS Fall Eastern Section Meeting , Middletown, CT, October 12, 2008 [abstract Cohomology jumping loci Topology Seminar , MIT , October 6, 2008Spectral sequences and homology with local coefficients Conference in honour of Peter Orlik , Fields Institute , Toronto, ON, August 19, 2008 [abstract audio Which Kähler groups are 3-manifold groups? International Conference in Algebraic Geometry , Mathematics Institute of the Romanian Academy , Bucharest, Romania, July 3, 2008 [abstract slides Polyhedral products abstract slides Topology and combinatorics of polyhedral products Algebra and Geometry Seminar , Stockholm University , Sweden, June 5, 2008 [announcement slides Minimal models in algebra, combinatorics and topology Alexander Berglund , Stockholm University , Sweden, June 3, 2008 [announcement Homotopy-type invariants of polyhedral products Algebraic Topology Seminar , Université Catholique de Louvain , Louvain la Neuve, Belgium, May 27, 2008Which 3-manifold groups are Kähler groups? Special Session on Arrangements and Related Topics , AMS Spring Southeastern Meeting , Baton Rouge, LA, March 29, 2008 [abstract slides
Which Kähler groups are 3-manifold groups? Analysis and Geometry Seminar , Northeastern University, November 30, 2007 [abstract Cohomology jumping loci and quasi-projective varieties Mathematics Institute of the Romanian Academy , Bucharest, Romania, October 12, 2007 [announcement The topology of the boundary manifold of a projective hypersurface Université de Nice , France, September 27, 2007Generalized moment angle complexes Université de Nice , France, September 24, 2007The equivariant spectral sequence and cohomology with local coefficients Mini-Workshop on Topology of Closed One-Forms and Cohomology Jumping Loci , Mathematisches Forshungsinstitut , Oberwolfach, Germany, August 16, 2007 [extended abstract Jumping loci and finiteness properties of groups Mini-Workshop on Topology of Closed One-Forms and Cohomology Jumping Loci , Mathematisches Forshungsinstitut , Oberwolfach, Germany, August 13, 2007 [extended abstract Fundamental groups and geometry Quasi-projective Bestvina-Brady groups Conference on Braids and their Ramifications , Palazzone di Cortona , Italy, May 23, 2007 [abstract slides Cohomology support loci, formality, and fundamental groups of quasi-projective varieties Purdue University , West Lafayette, IN, March 7, 2007 [abstract Cohomology jumping loci
Some combinatorial constructions in topology and group theory Università di Pisa , Italy, November 9, 2006 Boundary manifolds of complex hypersurfaces Math Seminar, ICTP , Trieste, Italy, November 6, 2006 [announcement Fundamental group computations in the theory of arrangements and related spaces Workshop on Topological Methods in Combinatorics, Computational Geometry, and the Study of Algorithms , MSRI , Berkeley, CA, October 2, 2006 [video Cohomology jumping loci and fundamental groups of projective varieties Topology Seminar, University of Oregon , Eugene, OR, September 25, 2006 [abstract Cohomology jumping loci, formality, and quasi-projectivity Workshop on Recent Developments in Arrangements and Configuration Spaces , MSRI , Berkeley, CA, August 8, 2006 [video
Configuration spaces and non-formality Algebra Seminar, University of Western Ontario , London, ON, Canada, November 21, 2005 Boundary manifolds of complex projective hypersurfaces GASC Seminar , Northeastern University, November 7, 2005 [abstract On the algebra and topology of right-angled Artin groups Algebraic Topology Seminar , Université Catholique de Louvain , Louvain la Neuve, Belgium, October 24, 2005 Algebraic invariants for Bestvina-Brady groups Pacific Institute for the Mathematical Sciences , Vancouver, Canada, August 21, 2005Free partially commutative groups and Lie algebras Arrangements of Hyperplanes – Algebra, Combinatorics, Geometry, and Topology , Ascona, Switzerland, May 19, 2005 [abstract Configuration spaces and embedding obstructions (with David Wilson)Borsuk-Ulam theorem and applications (with Marcus Fries )notes Graphs, groups, and polynomials (with Marcus Fries )Research & Technology Expo 2005 , Northeastern University, March 16, 2005Graphs, groups, and cohomology GASC Seminar , Northeastern University, February 14, 2005 [abstract
A look at right-angled Artin groups Workshop on Combinatorial Aspects of Hyperplane Arrangements , MSRI , Berkeley, CA, November 5, 2004 [video Topology of complex line arrangements MSRI-Evans talk , University of California , Berkeley, CA, October 25, 2004 [abstract Lie algebras associated to arrangements Introductory Workshop in Hyperplane Arrangements and Applications , MSRI , Berkeley, CA, August 26, 2004 [video Fundamental groups and characteristic varieties Introductory Workshop in Hyperplane Arrangements and Applications , MSRI , Berkeley, CA, August 24, 2004 [video Topology of complex line arrangements (7 lectures)MSRI Summer Graduate Program on Hyperplane Arrangements and Applications , University of Oregon , Eugene, OR, August 2-13, 2004Counting homomorphisms to finite groups notes What is a hyperplane arrangement? On the decomposability of the holonomy Lie algebra of an arrangement Special Session on Geometry and Combinatorics , Joint Mathematics Meetings , Phoenix, AZ, January 8, 2004 [abstract
Arrangements of hyperplanes and graded Lie algebras Topology Seminar , University of Lille 1 , Villeneuve d’Ascq, France, November 7, 2003 [abstract Graded Lie algebras associated to hyperplane arrangements abstract Systolic inequalities and Massey products Fifth Congress of Romanian Mathematicians , University of Pitești , Romania, June 25, 2003Free abelian covers and systolic inequalities Analysis and Geometry Seminar , Northeastern University, May 16, 2003 [abstract Alexander invariants and lower central series Yale University , April 24, 2003Fundamental groups of complex hyperplane arrangements Special Session on Algebraic and Topological Combinatorics , AMS Spring Eastern Section Meeting, New York, NY, April 12, 2003 [abstract
Counting finite-index subgroups and subalgebras Algebra Seminar, University of Western Ontario , London, ON, Canada, December 6, 2002 Rational homotopy groups, lower central series, and Koszul algebras University of Western Ontario , London, ON, Canada, December 5, 2002 [abstract Counting finite-index subgroups via p-adic integration Zeta functions of groups Chen Lie algebras and combinatorics of arrangements Special Session on Arrangements of Hyperplanes , AMS Fall Central Section Meeting, Madison, WI, October 13, 2002 [abstract Chen ranks of arrangements Special Session on Algebraic Geometry and Combinatorics , AMS Spring Western Section Meeting, Portland, OR, June 21, 2002Fundamental groups of complex hyperplanes arrangements Topology Seminar , The Ohio State University , Columbus, OH, May 24, 2002Virtual jumping loci Mini-Workshop on Cohomology Jumping Loci , Mathematisches Forshungsinstitut , Oberwolfach, Germany, March 9, 2002Torsion in the homology of the Milnor fiber of a multi-arrangement Mini-Workshop on Cohomology Jumping Loci , Mathematisches Forshungsinstitut , Oberwolfach, Germany, March 6, 2002Zeta functions of Orlik-Solomon algebras Mini-Workshop on Cohomology Jumping Loci , Mathematisches Forshungsinstitut , Oberwolfach, Germany, March 5, 2002Lower central series, free resolutions, and homotopy Lie algebras of arrangements Arrangements and Mathematical Physics , LSU, Baton Rouge, January 11, 2002. [abstract slides
Fundamental groups of hyperplane arrangements University of Rochester , Rochester, NY, November 9, 2001Rescaling formulas for rational homotopy groups University of Rochester , Rochester, NY, November 8, 2001Lower central series and free resolutions of arrangements Special Session on Algebraic and Topological Combinatorics , AMS Fall Eastern Section Meeting, Williamstown, MA, October 13, 2001 [abstract slides Arrangements of hyperplanes and enumerative techniques in group theory (2 lectures)Topology Seminar , Mathematics Institute of the Romanian Academy , Bucharest, Romania, July 13 and 20, 2001Platonic solids
Topology of complex line arrangements McMaster University , Hamilton, ON, Canada, December 15, 2000 Fundamental groups of arrangements Workshop on Arrangements , Forschungsinstitut für Mathematik , ETH Zürich, December 7, 2000 [abstract Topology of hyperplane arrangements (Invited address )A.M.S. Fall Eastern Section Meeting , New York, NY, November 5, 2000 [slides The Poincaré conjecture Counting subgroups of finite index slides Homotopy groups and characteristic varieties NU Tech Expo 2000 , Northeastern University, May 11, 2000 [abstract Counting representations onto finite groups, and torsion points on characteristic varieties Special Session on Enumerative Geometry in Physics , AMS Spring Eastern Section Meeting, Lowell, MA, April 2, 2000Cohomological jumping loci and finite-index subgroups Technion , Haifa, Israel, March 16, 2000Hall invariants and characteristic varieties Tel Aviv University , Israel, March 14, 2000Braids, links, and hyperplane arrangements Bar Ilan University , Tel Aviv, Israel, March 8, 2000 [announcement Hall invariants and the Alexander stratification of character varieties Geometric Topology Seminar , Columbia University , February 25, 2000 [announcement
Braids, links, and hyperplane arrangements University of Iowa , December 8, 1999Representations to finite groups and homology jumping loci University of Iowa , December 7, 1999Topology of hyperplane arrangements University of Illinois at Chicago , December 6, 1999Cohomology jumping loci and finite covers Brandeis University , September 28, 1999Recognizing surfaces (with Ivo Nikolov ) poster Cohomology rings, nilpotent quotients, and resonance varieties GASC Seminar , Northeastern University, April 12, 1999 [abstract
Combinatorics and topology of complements of planes in R4 Tokyo Metropolitan University , Tokyo, Japan, July 16, 1998On the difference between the fundamental groups of real and complex arrangements Fundamental Groups in Geometry , Mathematisches Forshungsinstitut , Oberwolfach, Germany, May 6, 1998Fundamental groups of real and complex arrangements (with Daniel Matei )abstract slides Characteristic varieties of real and complex arrangements Combinatorics Seminar , MIT , March 18, 1998 [abstract
Homotopy types of subspace arrangements Brandeis University , November 18, 1997Topology and combinatorics of arrangements Laboratoire de Topologie , Université de Bourgogne , Dijon, France, July 2, 1997Hyperplane arrangements: Alexander invariants, Chen groups, and characteristic varieties Differential Geometry Seminar , Institut Élie Cartan , Université Henri Poincaré , Nancy, France, July 1, 1997Topology and combinatorics of hyperplane arrangements Differential Geometry Seminar , Institut Élie Cartan , Université Henri Poincaré , Nancy, France, June 24, 1997Hyperplane arrangements and braid groups IRMA , Université Louis Pasteur , Strasbourg, France, June 20, 1997Topology and combinatorics of hyperplane arrangements Université de Haute Alsace , Mulhouse, France, June 19, 1997Framed manifolds, knots, and homology spheres Differential Geometry Seminar , Institut Élie Cartan , Université Henri Poincaré , Nancy, France, June 17, 1997Alexander invariants of arrangements University of Wisconsin , May 20, 1997 [slides Braid monodromy of arrangements Indiana University-Purdue University at Indianapolis , January 24, 1997Braid monodromy and Alexander invariants of arrangements Indiana University , January 23, 1997Hyperplane arrangements and braid groups Indiana University , January 22, 1997
Gromov norm and bounded cohomology (6 lectures)Combinatorics and topology of complex line arrangements Topology of hyperplane arrangements (2 talks)Louisiana State University , April 22–23, 1996Hyperplane arrangements, braid monodromy, and representations of braid groups Special Session on Low Dimensional Topology , AMS Meeting, Baton Rouge, LA, April 20, 1996Braid monodromy of hyperplane arrangements and representations of braid groups Special Session and Workshop on Arrangements of Hyperplanes , AMS Central Section Meeting, Iowa City, IA, March 23, 1996
The braid monodromy of complex hyperplane arrangements SUNY at Stony Brook , November 14, 1995The Knizhnik–Zamolodchikov equations (5 lectures)The braid monodromy of complex hyperplane arrangements GAS Seminar , Northeastern University, October 10, 1995The Seiberg–Witten equations (7 lectures)
Chen groups of arrangements Centre International de Rencontres Mathématiques , Luminy, France, July 7, 1994The Chen groups of hyperplane arrangements GAS Seminar , Northeastern University, June 20, 1994Complements of discriminants and braid arrangements GAS Seminar , Northeastern University, May 23, 19944-Manifolds (3 lectures)
Alexander modules of hyperplane arrangements SUNY at Albany , October 31, 1993Alexander modules of arrangements GAS Seminar , Northeastern University, September 27, 1993Complements of hyperplane arrangements Milnor fibrations of homogeneous polynomials GAS Seminar , Northeastern University, May 10, 1993Introduction to quantum field theory and 3-manifold invariants Analysis-Geometry Seminar , Northeastern University, February 19, 1993
Representations of mapping class groups GAS Seminar , Northeastern University, April 17, 1992Milnor fibrations of hyperplane arrangements GAS Seminar , Northeastern University, 1992
Homology isomorphisms between algebraic groups made discrete SUNY at Albany , October 13, 1991Homology of Lie groups made discrete GAS Seminar , Northeastern University, October 4, 1991Frame-spinning and non-reflexive knots SUNY at Binghamton , May 13, 1991Knots and framed manifolds GAS Seminar , Northeastern University, May 10, 1991High-dimensional knots with the same complement Topology Seminar , MIT , February 11, 1991
Framed manifolds and high-dimensional knots with the same complement SUNY at Albany , November 11, 1990Inequivalent frame-spun knots with the same complement Yale University , May 11, 1990Frame-spinning and non-reflexive knots Brandeis University , April 20, 1990
The second homology of groups of germs of diffeomorphisms Special Session on Low-dimensional Topology , A.M.S. Fall Eastern Sectional Meeting, Hoboken, NJ, October 22, 1989The second homology of jet groups Homology spheres, framed bordism, and the plus construction
Iterated spinning and homology spheres Yale University , 1988
Representing homology classes in rational surfaces Fibered knots and spherical space forms Brandeis University , 1987
The homotopy type of four-dimensional manifolds McMaster University , Hamilton, ON, Canada, October 1986Homotopy-type invariants of 4-manifolds Dartmouth College , September 27, 1986Homotopy-type invariants of four-dimensional manifolds
Homology 4-spheres Yale University , October 17, 1985Rational homotopy theory of Kähler manifolds (4 lectures)Yale University , 1985Knots with finite commutator subgroup Yale University , 1985Immersed spheres in rational surfaces Yale University , 1985
Homotopy-type invariants of 4-dimensional knot complements Yale University , 1984The homotopy type of 4-dimensional knot complements Columbia University , 1984Euler characteristics of groups (3 lectures)Columbia University , 1984