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Meetings & Conferences   (Plenary talks)

• Homotopy-type invariants of 4-manifolds
  Fall Foliage Topology Conference, Dartmouth College, September 27, 1986
• The homotopy type of four-dimensional manifolds
  Ontario Topology Conference, McMaster University, Hamilton, ON, Canada, October 1986
• Complements of hyperplane arrangements
  Cech Centennial Homotopy Theory Conference, Northeastern University, June 25, 1993
• Chen groups of arrangements
  Colloque sur les Arrangements d'Hyperplans, Centre International de Rencontres Mathématiques, Luminy, France, July 7, 1994
• On the difference between the fundamental groups of real and complex arrangements
  Meeting on Fundamental Groups in Geometry, Mathematisches Forshungsinstitut, Oberwolfach, Germany, May 6, 1998
• Combinatorics and topology of complements of planes in R⁴
  Workshop on Mathematics Related with Arrangements of Hyperplanes, Tokyo Metropolitan University, Tokyo, Japan, July 16, 1998
• Topology of hyperplane arrangements (Invited address)
  A.M.S. Fall Eastern Section Meeting, New York, NY, November 5, 2000   [slides]
• Fundamental groups of arrangements
  Workshop on Arrangements, Forschungsinstitut für Mathematik, ETH Zürich, December 7, 2000 [abstract ]
• Lower central series, free resolutions, and homotopy Lie algebras of arrangements
  NSF-CBMS Regional Research Conference Arrangements and Mathematical Physics, LSU, Baton Rouge, January 11, 2002   [abstract] [slides]
• Torsion in the homology of the Milnor fiber of a multi-arrangement
  Mini-Workshop on Cohomology Jumping Loci, Mathematisches Forshungsinstitut, Oberwolfach, Germany, March 6, 2002
• Virtual jumping loci
  Mini-Workshop on Cohomology Jumping Loci, Mathematisches Forshungsinstitut, Oberwolfach, Germany, March 9, 2002
• Systolic inequalities and Massey products
  Fifth Congress of Romanian Mathematicians, University of Pitesti, Romania, June 25, 2003
• Fundamental groups and characteristic varieties
  Introductory Workshop in Hyperplane Arrangements and Applications, MSRI, Berkeley, CA, August 24, 2004   [video]
• Lie algebras associated to arrangements
  Introductory Workshop in Hyperplane Arrangements and Applications, MSRI, Berkeley, CA, August 26, 2004   [video]
• A look at right-angled Artin groups
  Workshop on Combinatorial Aspects of Hyperplane Arrangements, MSRI, Berkeley, CA, November 5, 2004   [video]
• Free partially commutative groups and Lie algebras
  Arrangements of Hyperplanes - Algebra, Combinatorics, Geometry, and Topology, Ascona, Switzerland, May 19, 2005   [abstract]
• Algebraic invariants for Bestvina-Brady groups
  Hyperplane Arrangements Workshop, Pacific Institute for the Mathematical Sciences, Vancouver, Canada, August 21, 2005
• Cohomology jumping loci, formality, and quasi-projectivity
  Workshop on Recent Developments in Arrangements and Configuration Spaces, MSRI, Berkeley, CA, August 8, 2006 [video]
• 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]
• Quasi-projective Bestvina-Brady groups
  Conference on Braids and their Ramifications, Palazzone di Cortona, Italy, May 23, 2007   [abstract] [slides]
• Jumping loci and finiteness properties of groups
  Miniworkshop on Topology of Closed One-Forms and Cohomology Jumping Loci, Mathematisches Forshungsinstitut, Oberwolfach, Germany, August 13, 2007   [extended abstract]
• The equivariant spectral sequence and cohomology with local coefficients
  Miniworkshop on Topology of Closed One-Forms and Cohomology Jumping Loci, Mathematisches Forshungsinstitut, Oberwolfach, Germany, August 16, 2007   [extended abstract]
• 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]
• Spectral sequences and homology with local coefficients
  Conference in honour of Peter Orlik, Fields Institute, Toronto, ON, August 19, 2008   [abstract ] [audio]
• Jump loci and homological finiteness properties
  Workshop on Fundamental Groups in Algebraic Geometry, Université de Nice, France, May 26, 2009
• Characteristic varieties and homological finiteness properties
  LIB60BER - Topology of Algebraic Varieties, Jaca, Spain, June 24, 2009   [abstract] [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]
• Fundamental groups of smooth, (quasi-) projective varieties
  Singularity Day, University of Warwick, United Kingdom, November 4, 2009

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Meetings & Conferences   (Shorter talks)

• The second homology of groups of germs of diffeomorphisms
  Special Session, A.M.S. Meeting, Hoboken, NJ, October 1989
• Homology isomorphisms between algebraic groups made discrete
  Topology and Group Theory Conference, SUNY at Albany, October 13, 1991
• Alexander modules of hyperplane arrangements
  Topology and Group Theory Conference, SUNY at Albany, October 30, 1993
• Braid 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 1996
• Hyperplane arrangements, braid monodromy, and representations of braid groups
  Special Session on Low Dimensional Topology, AMS Meeting, Baton Rouge, LA, April 1996
• Alexander invariants of arrangements
  Minisymposium on Arrangements of Hyperplanes, Mathematics Ph.D. Centennial Conference, University of Wisconsin, May 20, 1997
• 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, 2000
• Lower 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]
• Zeta functions of Orlik-Solomon algebras
  Mini-Workshop on Cohomology Jumping Loci, Mathematisches Forshungsinstitut, Oberwolfach, Germany, March 5, 2002
• Chen ranks of arrangements
  Special Session on Algebraic Geometry and Combinatorics, AMS Spring Western Section Meeting, Portland, OR, June 21, 2002
• Chen Lie algebras and combinatorics of arrangements
  Special Session on Arrangements of Hyperplanes, AMS Fall Central Section Meeting, Madison, WI, October 13, 2002   [abstract]
• Fundamental groups of complex hyperplane arrangements
  Special Session on Algebraic and Topological Combinatorics, AMS Spring Eastern Section Meeting, New York, NY, April 12, 2003   [abstract]
• On the decomposability of the holonomy Lie algebra of an arrangement
  Special Session on Geometry and Combinatorics, AMS National Meeting, Phoenix, AZ, January 8, 2004   [abstract]
• Which 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]
• 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]
• A look at polyhedral products
  Special Session on Topological Robotics, AMS Spring Eastern Section Meeting, Worcester, MA, April 24, 2009   [abstract]

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Colloquia

• Framed manifolds and high-dimensional knots with the same complement
  SUNY at Albany, November 1990
• Frame-spinning and non-reflexive knots
  SUNY at Binghamton, May 1991
• Topology and combinatorics of arrangements
  Laboratoire de Topologie, Université de Bourgogne, Dijon, France, July 2, 1997
• Braids, links, and hyperplane arrangements
  University of Iowa, December 8, 1999
• Braids, links, and hyperplane arrangements
  Bar Ilan University, Tel Aviv, Israel, March 8, 2000   [announcement ]
• Topology of complex line arrangements
  McMaster University, Hamilton, ON, Canada, December 15, 2000   [announcement ]
• Fundamental groups of hyperplane arrangements
  University of Rochester, Rochester, NY, November 9, 2001
• Rational homotopy groups, lower central series, and Koszul algebras
  University of Western Ontario, London, ON, Canada, December 5, 2002   [abstract]
• Topology of complex line arrangements
  MSRI-Evans talk, University of California, Berkeley, CA, October 25, 2004   [abstract]
• Cohomology support loci, formality, and fundamental groups of quasi-projective varieties
  Purdue University, West Lafayette, IN, March 7, 2007   [abstract ]
• Fundamental groups and cohomology support loci
  University of Liverpool, United Kingdom, October 2, 2009   [slides]
• Geometry and topology of cohomology jumping loci
  University at Albany, December 4, 2009   (upcoming)

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Seminars

• Homotopy-type invariants of 4-dimensional knot complements
  Topology Seminar, Yale University, 1984
• The homotopy type of 4-dimensional knot complements
  Topology Seminar, Columbia University, 1984
• Knots with finite commutator subgroup
  Topology Seminar, Yale University, 1985
• Immersed spheres in rational surfaces
  Topology Seminar, Yale University, 1985
• Homology 4-spheres
  Topology Seminar, Yale University, 1986
• Homotopy-type invariants of four-dimensional manifolds
  Geometry Seminar, Northeastern University, April 1986
• Representing homology classes in rational surfaces
  Geometry Seminar, Northeastern University, October 1987
• Fibered knots and spherical space forms
  Topology Seminar, Brandeis University, 1987
• Iterated spinning and homology spheres
  Topology Seminar, Yale University, 1988
• The second homology of jet groups
  Geometry Seminar, Northeastern University, October 1989
• Homology spheres, framed bordism, and the plus construction
  Topology Seminar, Northeastern University, October 1989
• Frame-spinning and non-reflexive knots
  Topology Seminar, Brandeis University, April 1990
• Inequivalent frame-spun knots with the same complement
  Topology Seminar, Yale University, May 11, 1990
• High-dimensional knots with the same complement
  Topology Seminar, MIT, February 1991
• Knots and framed manifolds
  GAS Seminar, Northeastern University, May 1991
• Homology of Lie groups made discrete
  GAS Seminar, Northeastern University, October 1991
• Representations of mapping class groups
  GAS Seminar, Northeastern University, April 1992
• Milnor fibrations of hyperplane arrangements
  GAS Seminar, Northeastern University, 1992
• Milnor fibrations of homogeneous polynomials
  GAS Seminar, Northeastern University, May 10, 1993
• Alexander modules of arrangements
  GAS Seminar, Northeastern University, September 27, 1993
• Complements of discriminants and braid arrangements
  GAS Seminar, Northeastern University, May 23, 1994
• The Chen groups of hyperplane arrangements
  GAS Seminar, Northeastern University, June 20, 1994
• The braid monodromy of complex hyperplane arrangements
  GAS Seminar, Northeastern University, October 1995
• The braid monodromy of complex hyperplane arrangements
  Topology and Geometry Seminar, SUNY at Stony Brook, November 1995
• Topology of hyperplane arrangements
  (2 talks), Topology Seminar, Louisiana State University, April 1996
• Combinatorics and topology of complex line arrangements
  Combinatorics Seminar, Northeastern University, September 1996
• Hyperplane arrangements and braid groups
  Topology Seminar, Indiana University, January 22, 1997
• Braid monodromy and Alexander invariants of arrangements
  Topology-Geometry Reading Seminar, Indiana University, January 23, 1997
• Braid monodromy of arrangements
  Analysis Seminar, Indiana University-Purdue University at Indianapolis, January 24, 1997
• Framed manifolds, knots, and homology spheres
  Differential Geometry Seminar, Institut Élie Cartan, Université Henri Poincaré, Nancy, France, June 17, 1997
• Topology and combinatorics of hyperplane arrangements
  Geometry Seminar, Université de Haute Alsace, Mulhouse, France, June 19, 1997
• Hyperplane arrangements and braid groups
  Topology-Geometry Seminar, IRMA, Université Louis Pasteur, Strasbourg, France, June 20, 1997
• Topology and combinatorics of hyperplane arrangements
  Differential Geometry Seminar, Institut Élie Cartan, Université Henri Poincaré, Nancy, France, June 24, 1997
• Hyperplane arrangements: Alexander invariants, Chen groups, and characteristic varieties
  Differential Geometry Seminar, Institut Élie Cartan, Université Henri Poincaré, Nancy, France, July 1, 1997
• Homotopy types of subspace arrangements
  Topology Seminar, Brandeis University, November 18, 1997
• Characteristic varieties of real and complex arrangements
  Combinatorics Seminar, MIT, March 18, 1998   [abstract]
• Cohomology rings, nilpotent quotients, and resonance varieties
  GASC Seminar, Northeastern University, April 12, 1999   [abstract]
• Cohomology jumping loci and finite covers
  Topology Seminar, Brandeis University, September 28, 1999
• Topology of hyperplane arrangements
  Algebraic Geometry Seminar, University of Illinois at Chicago, December 6, 1999
• Representations to finite groups and homology jumping loci
  Topology Seminar, University of Iowa, December 7, 1999
• Hall invariants and the Alexander stratification of character varieties
  Geometric Topology Seminar, Columbia University, February 25, 2000
• Hall invariants and characteristic varieties
  Geometry and Topology Seminar, Tel Aviv University, Israel, March 14, 2000
• Cohomological jumping loci and finite-index subgroups
  Geometric Analysis Seminar, Technion, Haifa, Israel, March 16, 2000
• 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, 2001
• Rescaling formulas for rational homotopy groups
  Topology Seminar, University of Rochester, Rochester, NY, November 8, 2001
• Fundamental groups of complex hyperplanes arrangements
  Topology Seminar, The Ohio State University, Columbus, OH, May 24, 2002
• Counting finite-index subgroups and subalgebras
  Algebra Seminar, University of Western Ontario, London, ON, Canada, December 6, 2002  
• Alexander invariants and lower central series
  Topology Seminar, Yale University, April 24, 2003
• Free abelian covers and systolic inequalities
  Analysis and Geometry Seminar, Northeastern University, May 16, 2003   [abstract]
• Graded Lie algebras associated to hyperplane arrangements
  GASC Seminar, Northeastern University, October 20, 2003   [abstract]
• Arrangements of hyperplanes and graded Lie algebras
  Topology Seminar, University of Lille 1, Villeneuve d'Ascq, France, November 7, 2003   [abstract ]
• Graphs, groups, and cohomology
  GASC Seminar, Northeastern University, February 14, 2005   [abstract]
• On the algebra and topology of right-angled Artin group
  Algebraic Topology Seminar, Université Catholique de Louvain, Louvain la Neuve, Belgium, October 24, 2005   [announcement ]
• Boundary manifolds of complex projective hypersurfaces
  GASC Seminar, Northeastern University, November 7, 2005   [abstract]
• Configuration spaces and non-formality
  Algebra Seminar, University of Western Ontario, London, ON, Canada, November 21, 2005   [announcement ]
• Cohomology jumping loci and fundamental groups of projective varieties
  Topology Seminar, University of Oregon, Eugene, OR, September 25, 2006   [abstract]
• Boundary manifolds of complex hypersurfaces
  Math Seminar, ICTP, Trieste, Italy, November 6, 2006   [announcement]
• Some combinatorial constructions in topology and group theory
  Topology Seminar, Università di Pisa, Italy, November 9, 2006   [announcement ]
• Generalized moment angle complexes
  Algebra and Topology Seminar, Université de Nice, France, September 24, 2007   [announcement ] [abstract]
• The topology of the boundary manifold of a projective hypersurface
  D-Modules and Singularities Seminar, Université de Nice, France, September 27, 2007   [abstract ]
• Cohomology jumping loci and quasi-projective varieties
  Topology Seminar, Mathematics Institute of the Romanian Academy, Bucharest, Romania, October 12, 2007   [announcement]
• Which Kaehler groups are 3-manifold groups?
  Analysis and Geometry Seminar, Northeastern University, November 30, 2007   [abstract]
• Homotopy-type invariants of polyhedral products
  Algebraic Topology Seminar, Université Catholique de Louvain, Louvain la Neuve, Belgium, May 27, 2008
• Topology and combinatorics of polyhedral products
  Algebra and Geometry Seminar, Stockholm University, Sweden, June 5, 2008   [announcement]   [slides]
• Cohomology jumping loci
  Topology Seminar, MIT, October 6, 2008
• Finiteness properties of groups and homology jumping loci
  GASC Seminar, Northeastern University, October 27, 2008   [abstract]
• Geometry and topology of cohomology jumping loci
  Topology Seminar, CUNY Graduate Center, November 20, 2008
• Partial products of circles
  Algebra and Geometry Seminar, VU University Amsterdam, The Netherlands, October 13, 2009   [slides]
• Algebra and topology of right-angled Artin groups
  Algebra Seminar, University of Leeds, United Kingdom, October 19, 2009   [slides]
• The Alexander polynomial and its friends
  Geometry and Topology Seminar, University of Warwick, United Kingdom, November 5, 2009
• Cohomology jump loci, Sigma-invariants, and fundamental groups of algebraic varieties
  Topology Seminar, University of Oxford, United Kingdom, November 16, 2009   [slides]
• How to compute the homology of the Milnor fibre of a non-isolated weighted homogeneous singularity
  Singularities Seminar, University of Warwick, United Kingdom, November 23, 2009

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Expository Talks and Mini-Courses

• The Poincaré conjecture in dimension four (3 lectures)
  Topology Seminar, Pennsylvania State University, 1983
• Groups of cohomological dimension one (3 lectures)
  Group Theory Seminar, Columbia University, 1983
• Euler characteristics of groups (3 lectures)
  Group Theory Seminar, Columbia University, 1984
• Rational homotopy theory of Kähler manifolds (4 lectures)
  Rational Homotopy Seminar, Yale University, 1985
• Introduction to quantum field theory and 3-manifold invariants
  Analysis-Geometry Seminar, Northeastern University, February 19, 1993
• 4-Manifolds (3 lectures)
  Basic Notions Seminar, Northeastern University, February 1994
• The Seiberg-Witten equations (7 lectures)
  Basic Notions Seminar, Northeastern University, January-March 1995
• The Knizhnik-Zamolodchikov equations (5 lectures)
  Basic Notions Seminar, Northeastern University, October-November 1995
• Gromov norm and bounded cohomology (6 lectures)
  Basic Notions Seminar, Northeastern University, 1996
• Counting subgroups of finite index
  Graduate Student Seminar, Northeastern University, May 15, 2000
• The Poincaré conjecture
  Basic Notions Seminar, Northeastern University, October 26, 2000
• Platonic solids
  GAANN Seminar, Advanced Scientific Computation Center, Northeastern University, May 1, 2001
• Zeta functions of groups
  Basic Notions Seminar, Northeastern University, October 17, 2002
• Counting finite-index subgroups via p-adic integration
  Basic Notions Seminar, Northeastern University, October 31, 2002
• What is a hyperplane arrangement?
  Student Seminar, Northeastern University, February 10, 2004
• Counting homomorphisms to finite groups
  Tapas Seminar, Northeastern University, May 20, 2004   [notes]
• Topology of complex line arrangements (7 lectures)
  MSRI Summer Graduate Program on Hyperplane Arrangements and Applications, University of Oregon, Eugene, OR, August 2004
• Borsuk-Ulam theorem and applications (with Marcus Fries)
  Tapas Seminar, Northeastern University, May 9, 2005   [notes]
• Configuration spaces and embedding obstructions (with David Wilson)
  Tapas Seminar, Northeastern University, May 11, 2005
• Cohomology jumping loci
  Alumni Conference, Northeastern University, February 24, 2007
• Fundamental groups and geometry
  Tapas Seminar, Northeastern University, June 6, 2007
• Minimal models in algebra, combinatorics and topology
  Report on the Ph.D. Thesis of Alexander Berglund, Stockholm University, Sweden, June 3, 2008   [announcement ]
• Polyhedral products
  Tapas Seminar, Northeastern University, June 19, 2008   [abstract] [slides]
• Introduction to toric topology (with Alvise Trevisan)
  Tapas Seminar, Northeastern University, May 14, 2009

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Poster Sessions

• Fundamental groups of real and complex arrangements (with Daniel Matei)
  Centennial Poster Session, Northeastern University, May 4, 1998   [abstract]
• Recognizing surfaces (with Ivo Nikolov)
  Poster Session: Connections '99, Northeastern University, May 10, 1999   [ poster ]
• Homotopy groups and characteristic varieties
  NU Tech Expo 2000, Northeastern University, May 11, 2000   [abstract]
• Graphs, groups, and polynomials (with Marcus Fries)
  Research & Technology Expo 2005, Northeastern University, March 16, 2005