CURRICULUM VITAE  Karen Vogtmann
Goldwin Smith Professor of Mathematics
Cornell University 
Address 


Department of Mathematics
503 Malott Hall
Cornell University
Ithaca, NY 148534201
(607) 2556494
vogtmann@math.cornell.edu, K.Vogtmann@warwick.ac.uk 
Education 


 B.A. University of California, Berkeley 1971
 Ph.D. University of California, Berkeley 1977

Principal fields of interest 


 Geometric group theory
 Lowdimensional topology
 Cohomology of groups

Employment history 


 University of Warwick, Professor, 9/13 to present
 Cornell University
Goldwin Smith Professor of Mathematics, 7/11 to present
Professor, 1/94 to 7/11
Associate Professor, 7/87 to 12/93
Assistant Professor, 7/85 to 6/87
Visiting Assistant Professor, 9/84 to 6/85
 Columbia University, Assistant Professor, 7/79 to 6/86
 Brandeis University, Visiting Assistant Professor, 9/78 to 12/78
 University of Michigan, Visiting Assistant Professor, 9/77 to 6/78 and 1/79 to 6/79

Sabbatical and Research positions 


 Research Professor, ICERM, Providence, RI, 9/13 to 12/13
 Freie Universität Berlin, Berlin, Germany, 6/12
 MittagLeffler Institute, Stockholm, Sweden, 3/12 to 5/12
 Visiting Researcher, Oxford University, Oxford, England, 2/12
 Professeur invit´e, Marseilles, France, 5/11
 Hausdorff Institute for Mathematics, 9/09 to 12/09 and 5/108/10
 Mathematical Sciences Research Institute, Berkeley, 8/07 to 12/07
 I.H.E.S., BuressurYvette, France 3/04
 Professeur Invit´e, Marseilles, France, 3/00
 Mathematical Sciences Research Institute, Berkeley, 1/95 to 7/95
 I.H.E.S., BuressurYvette, France, 1/928/93
 Chercheur, C.N.R.S., E.N.S. de Lyon, France, 9/9212/92
 Mathematical Sciences Research Institute, Berkeley,1/89 to 6/89
 University of Illinois at Chicago, 1/88 to 6/88
 Institute for Advanced Study, Princeton.9/80 to 8/81

Research grants 


 National Science Foundation grants for research in mathematics 197879, 1983present
 National Science Foundation Visiting Professorship for Women grant, 198485
 National Science Foundation Career Advancement Award, 1989

Ph.D. Students 


 Thomas Brady (1988)
 Martin Bridson (1991)
 Debra Boutin (1998)
 Craig Jensen (1998)
 Lisa OrlandiKorner (1998)
 G. Christopher Hruska (2002)
 F. Gerlits (2002)
 Matt Horak (2003)
 Brad Forrest (2009)
 Owen Baker (2011)
 Victor Kotsyuk (2011)
 Juan Alonso (2012)

Professional service 


Scientific Advisory Boards
 Scientific Advisory Committee, International Summer School of Mathematics for Young Students (2012 )
 Steering Committee, Park City Mathematics Institute (2010 )
 Board on Mathematical Sciences and Their Applications of the National Academies (20102013 )
 U.S. National Committee for Mathematics (2009)
 Research Advisory Panel, Mathematics, Simons Foundation (2011)
 Scientific Advisory Committee of the Mathematical Sciences Research Institute (20062010)
 ArXiv Advisory Board (2004 )
 Scientific Research Board of the American Institute of Mathematics (19982005)
Editorial Boards
 Editorial Board, Geometry and Topology Monographs (2013 )
 Consulting Editor, Journal of the Edinburgh Math Society (2012 )
 Associate Editor, Journal of the AMS (2010 )
 Editorial Board, Algebraic and Geometric Topology, (2006  )
 Associate Editor, Research/Expository surveys, Bulletin of the A.M.S. (19982000)
American Mathematical Society
 Board of Trustees, American Mathematical Society (20082018 (chairman 2011))
 Vice President, American Mathematical Society, (20032006)
 AMS Committee on Education (20032006)
 AMS delegate to ICIAM board (May 2005)
 Executive Committee, American Mathematical Society (19992003)
 AMS Committee on Meetings and Conferences (19972003), chairman (20002003)
 MemberatLarge, Council of the AMS (19972000)
 AMS Fellowship Committee 198990 (chairman 1990)
External Review Panels
 External review panel, University of Texas at Austin, 2013
 External review panel, University of Southern California (2010)
 External review panel, CUNY (2008)
 External review panel, University of Utah, (chair, 2007)
 External review panel, University of Texas at Austin, 2004
 External review panel, Rutgers University Newark, 1997
Other Service
 National Science Foundation Committee of Visitors, 2013
 U.S. Delegation to the International Mathematical Union General Assembly (2006, 2010 (chair in 2010))
 National Research Council Panel to evaluate the VIGRE program (20072008)
 Vietnam Education Foundation mathematics panel (June 2005)
 Selection committee, NSF graduate fellowships in Mathematics, 1994, 199699 (chairman1999)
 Selection committee, Gehman lectures, Seaway section of the MAA, 1997
 AWM Noether Lecturer selection committee 19911993 (chairman 1993)
 Reviewer, Math Reviews 19771990
 Served on numerous panels at the National Science Foundation
 Referee for numerous professional journals

Conferences organized 


 (with S. Kerckhoff, D. Gabai, J. Smillie and D. Thurston) What's Next? The mathematical legacy of Bill Thurston, June 2014
 (with M. Culler, D. Calegari, D. Gabai, J. Hass, R. Lipshitz, G. Walsh) Topology, geometry and group theory, informed by experiment, ICERM, Providence, RI, October 2013
 (with M. Bridson, L. Kramer and B. Remy) Geometric group theory, Oberwolfach, June 2013
 (with B. Farb, G. Niblo and D. WitteMorris) Cohomological methods in geometric group theory, BIRS, Banff, November 2012
 (with M. Bestvina and M. Sageev) Park City/IAS summer math institute in Geometric Group Theory, July 2012
 (with Cornell topologists) Topology Festival, Cornell University, 19862012
 (with M. Bridson, M. BucherKarlsson, A. Karlsson, T. SmirnovaNagnibeda) Geometric and Analytic Methods in Group Theory, MittagLeffler Institute, Spring 2012
 (with S. Hermiller, J. Meier and D. Webb), Approaches to Group Theory, a conference in honor of Ken Brown, October 2010.
 (with M. Bridson, L. Kramer and B. Remy) Nonpositive curvature and geometric structures in group theory, Oberwolfach, April 2010
 (with M. Bestvina, J. McCammond and M. Sageev) Semester program in Geometric Group Theory, M.S.R.I., Berkeley, CA, Fall 2007
 (with M. Bestvina, J. McCammond and M. Sageev) Introductory workshop in Geometric Group Theory, M.S.R.I., Berkeley, CA, August 2731 2007
 (with R. Charney and I. Chatterji) Connections for Women: Classics of Geometric Group Theory, M.S.R.I., Berkeley, CA August 2324, 2007
 (with R. Charney) Special session on Geometric Group Theory, Annual meeting of the AMS, New Orleans, LA, January 2007
 (with M. Bridson and P. Kropholler) Topological and geometric methods in group theory, Oberwolfach, Germany, April 2006
 (with A. Chang, R. Charney, A. Grassi, CL Terng, and K. Uhlenbeck) The Geometry of Groups, Program for Women in Mathematics, Institute for Advanced Study and Princeton University, Princeton, NJ, May 2005
 (with S. Holmes and L. Billera) AIM workshop on Geometric models of biological phenomena, Palo Alto, CA, June 2003
 (with G. Levitt) Special session at joint meeting of AMS and French Mathematical Society, Lyon, France, July 2001
 (with H. Abels and P. Kropholler) Conference on Topological and Geometric Methods in Group Theory, Oberwolfach, Germany, January 2001
 (with R. Alperin) A.M.S. Special Session on Geometric Methods in Combinatorial Group Theory, November 1989.
 (with A. Borel and J. Harer) M.S.R.I. Workshop on Buildings and Arithmetic Groups, Berkeley, CA, May 1989

Publications 


 Homology Stability for On,n, Comm. Alg., 7 (1979), no.1., 938.
 Spherical Posets and homology stability for On,n, Topology 20 (1981), 119132.
 A Stieffel complex for the orthogonal group of a field, Comment. Math. Helv. 57 (1982), no.1, 1121.
 The integral homology of SL2 and PSL2 over Euclidean imaginary quadratic integers, (with J. Schwermer) Comment. Math. Helv. 58 (1983) no.4, 573598.
 Rational homology of Bianchi groups, Math. Ann. 272 (1985), 399419.
 Moduli of graphs and automorphisms of free groups, (with M. Culler) Inventionnes 84 (1986), 91119.
 A generating function for the Euler characteristic of Out(Fn), (with J. Smillie) J. Pure and Appl. Algebra 44 (1987), 329348.
 Automorphisms of graphs, psubgroups of Out(Fn) and the Euler characteristic of Out(Fn), (with J. Smillie) J. Pure and Appl. Algebra 49 (1987), 187200.
 Local structure of some Out(Fn)complexes, Proc. Edinburgh Math Soc. 33 (1990), 367379.
 The boundary of outer space in rank two, (with M. Culler) in Arboreal Group Theory (R. Alperin, ed) New York: SpringerVerlag (1991) 189229.
 Automorphisms of SL2 of imaginary quadratic integers, (with J. Smillie) Proc. A.M.S.112 (1991) no. 3
 Equivariant Outer space and automorphisms of freebyfinite groups (with S. Krstic),Comment. Math. Helvetici 68 (1993) 216262.
 Length functions and outer space (with J. Smillie), Michigan Math J. 39 (1992) 485493.
 End invariants of the group of outer automorphisms of a free group, Topology 14 (1995) no. 3, 533545.
 Isoperimetric inequalities for automorphism groups of free groups (with A. Hatcher), Pacific J. Math. 173 (1996), no. 2, 425441.
 On the geometry of the group of automorphisms of a free group (with M. Bridson), Bull. London Math. Soc. 27 (1995), 544552.
 A grouptheoretic criterion for property FA (with M. Culler), Proc. Amer. Math. Soc. 124 (1996), no. 3, 677683
 Cerf theory for graphs (with A. Hatcher), J. London Math. Soc., 58, part 3 (1998), 633655.
 The complex of free factors of a free group (with A. Hatcher), Quart. J. Math. Oxford Ser. (2) 49 (1998), no. 196, 459–468.
 Rational homology of Aut(Fn) (with A. Hatcher), Mathematical Research Letters 5 (1998), 759780.
 An Equivariant Whitehead algorithm and conjugacy for roots of Dehn twists (with S. Krstic and M. Lustig), Proceedings of the Edinburgh Math Society 44 (2001), 117141.
 A Whitehead algorithm for surface groups (with G. Levitt), Topology 39 (2000), no. 6, 1239–1251.
 The symmetries of Outer space (with M. R. Bridson), Duke Math Journal 106 (2001), 391–409.
 Automorphisms of automorphism groups of free groups (with M. R. Bridson), J. Algebra 229 (2000), no. 2, 785–792.
 Geometry of the space of phylogenetic trees (with L. Billera and S. Holmes), Advances in Applied Math 27 (2001), 733767.
 Automorphisms of free groups and outer space, Proceedings of the Conference on Geometric and Combinatorial Group Theory, Part I (Haifa, 2000). Geom. Dedicata 94 (2002), 1–31.
 Homomorphisms from automorphism groups of free groups, (with Martin R. Bridson), Bull. London Math. Soc. 35 (2003), no. 6, 785–792.
 Infinitesimal operations on graph complexes, (with James Conant), Math. Ann. 327 (2003), 545–573.
 On a theorem of Kontsevich, (with Jim Conant), Algebr. Geom. Topol. 3 (2003) 11671224.
 Cut vertices in commutative graphs, (with James Conant and Ferenc Gerlits), Quart. J. Math 56(3) (2005), 321336.
 Morita classes in the homology of automorphism groups of free groups, (with Jim Conant), Geom. Topol. 8 (2004), 14711499.
 Homology stability for outer automorphism groups of free groups, (with Allen Hatcher), Algebr. Geom. Topol. 4 (2004), 12531272.
 Erratum to: homology stability for outer automorphism groups of free groups, (with Allen Hatcher and Nathalie Wahl), Algebr. Geom. Topol. 20 (2006), 573579.
 Automorphism groups of free groups, surface groups and free abelian groups, (with Martin Bridson), in Problems on Mapping Class Groups, edited by B.Farb, Proc. Symposia in Pure Mathemaics, AMS, Providence, RI, 2006, 301316.
 The cohomology of automorphism groups of free groups, Proceedings of the International Congress of Mathematicians, Madrid 2006, EMS, Zurich, Switzerland, 11011119.
 Morita classes in the homology of Aut(F_n) vanish after one stabilization, (with James Conant), Groups, Geometry and Dynamics 2 (1) (2008) 121138
 Automorphisms of two dimensional rightangled Artin groups, (with John Crisp and Ruth Charney), Geometry & Topology 11 (2007) 22272264.
 Automorphism groups of rightangled Artin Groups, Guido's book of conjectures, L'Enseignement Mathematiques Monographie No. 40, 2008.
 A presentation for Aut(F_n), (with Heather Armstrong and Bradley Forrest), to J. of Group Theory 11 (2008), 267276.
 Finiteness properties of automorphism groups of rightangled Artin groups (with Ruth Charney), Bull. London Math. Soc. (41) February (2009) 94  102.
 What is Outer space?, Notices of the AMS 55, No. 7 (2008) 784786.
 Automorphisms of twodimensional RAAGs and partially symmetric automorphisms of free groups (with K.U. Bux and R. Charney), Groups, Geometry and Dynamics 3 (4) (2009) 541–554
 Actions of automorphism groups of free groups on spheres and acyclic manifolds (with Martin Bridson), Commentarii Math. Helv. 86 (1) (2011)
 Subgroups and quotients of automorphism groups of RAAGs (with R. Charney), in
Lowdimensional and Symplectic Topology  Proceedings of Symposia in Pure and Applied Math., Michael Usher ed University of Georgia, Editor  AMS, 2011.
 Abelian covers of graphs and maps between outer automorphisms of free groups (with M. R. Bridson), Math. Ann. 353 (2012), no. 4, 1069–1102.
 The Dehn functions of Aut(F_n) and Out(F_n) (with M. R. Bridson), Annales de l'institut Fourier, 62 no. 5 (2012), p. 18111817
 Hairy graphs and the unstable homology of M(g,s), Out(F_n) and Aut(F_n), (with J. Conant and M. Kassabov), J Topology (2013) 6(1): 119153.
 and Actions of arithmetic groups on homology spheres and acyclic homology manifolds, (with M.R. Bridson and F. Grunewald), to appear in Math. Zeitschrift.
 Outer space for rightangled Artin groups I, (with R. Charney and Nathaniel Stambaugh), arXiv:1212.4791
 Higher hairy graph homology, (with J. Conant and M. Kassabov), arXiv:1308.3825.

Ten invited addresses 


 International Congress of Mathematicians, Madrid, Spain, August 2006
 Groups of Diffeomorphisms 2006, Conference in honor of S. Morita's 60th birthday, Tokyo, Japan, September 2006
 AWM Noether Lecture, New Orleans, LA, January 2007
 Geometry and the Imagination, conference in honor of William P. Thurston's 60th birthday, Princeton, NJ, June 2007
 Plenary address, AMS Spring Sectional Meeting, San Francisco, CA, April 2009
 Georgia International Topology Conference, Athens, GA, May 20099
 Felix Klein Lectures, Hausdorff Institute for Mathematics, Bonn, Germany, MayJune 2010
 Plenary Address, British Mathematical Colloquium, Leicester, England, April 2011
 2011 European Math Society Lectures (Barcelona, Oxford, Stockholm)
 Panorama of Topology, Conference in honor of William Browder, Princeton, New Jersey, May 2012

All invited lectures since 2001 


2001
 Special Session on Geometric Group Theory, Annual AMS meeting, New Orleans, LA, January 2001
 Topology Seminar, Columbia University, February 2001
 Conference on nonpositive curvature and analysis, Penn State University, State College, PA, March 2001
 Georgia Topology Conference, May 2001
 Graphs and Patterns in Mathematics and Theoretical Physics, A conference to celebrate Dennis Sullivan’s 60th birthday, Stony Brook, NY June 2001
 Workshop on Moduli Spaces, Stanford, CA, August 2001
 Colloquium, Northwestern University, November 2001
 Colloquium, University of Chicago, November 2001
 Topology Seminar, Duke University, December 2001
2002
 Algebraic Geometry Seminar, Duke University, Durham, NC, December 2002
 Group Theory Seminar, Graduate Center of CUNY, New York, NY February 2002
 Topology Seminar, Binghamton University, April 2002
 Colloquium, Neuchatel, Switzerland, June 2002
 Minicourse on outer space, Neuchatel, Switzerland, June 2002
 Topology seminar, Geneva, Switzerland, June 2002
 AMS Special session in Geometric Group Theory, Boston, October 2002
 Topology seminar, Stonybrook, NY, November 2002
 Colloquium, Stonybrook, NY, November 2002
2003
 Colloquium, University of Pennsylvania, Philadelphia, PA, February 2003
 Topology Seminar, Yale University, February 2003
 AMS special session on Rigidity in topology and dynamics, NewYork, NY April 2003.
 Topology Festival, Cornell, May 2003
 Durham Symposium, July 2003
 Stony Brook String Theory conference, August 2003
 Oberwolfach Topologie, September 2003
 Institut Henri Poincare, September 2003
 AMS special session, Binghamton, October 2003
 Albany Group Theory, October 2003
 Seminar, R.I.M.S., Kyoto, Japan, December 2003
2004
 Topology Seminar, Max Planck Institute, Bonn, Germany, March 2004
 AMS special session on Group Cohomology and related topics (in honor of William Browder’s 70th birthday), Lawrenceville, NJ, April 2004
 Colloquium, University of Illinois at ChampaignUrbana, April 2004
 Workshop on Classifying Spaces for Families, Munster, Germany, June 2004
 AMS special session on Topological and geometric methods in group theory, Nashville, TN, October 2004
 CMS special session on Combinatorial and Geometric Group Theory, Montreal, Quebec, December 2004
2005
 Colloquium, University of Tennessee, January 2005
 Topology Seminar, Columbia University, February 2005
 Algebra Seminar, University of Glasgow, March 2005
 Colloquium, Brandeis University, March 2005
 Midwest Topology Seminar, University of Chicago, April 2005
 Course in geometric group theory (4 lectures), Program for Women in Mathematics, IAS, Princeton, NJ, May 2005
 Colloquium, University of Education, Hanoi, Vietnam, June 2005
 Colloquium, VAST Institute of Mathematics, Hanoi, Vietnam, June 2005
 Barcelona Conference on Geometric Group Theory, Barcelona, Spain, June 2005
 Topology meeting, BIRS, Banff, Canada, August 2005
 Geometric and Probabilistic Methods in Group Theory and Dynamical Systems, Texas A&M, College Station, TX, October 2005
 Flavors of Groups meeting, BIRS, Banff, Canada, November 2005
 Wasatch Topology Conference, Park City, Utah, December 2005
2006
 Colloquium, Penn State University, March 2006
 University of Arkansas Spring Lecture Series, Fayetteville, AR, April 2006
 Combinatorial and geometric group theory, in honor of A. Yu. Olshanskii, Nashville, TN. May 2006
 Conference sur la theorie geometrique des groupes, Montreal, Canada, July 2006
 International Congress of Mathematicians, Madrid, Spain, August 2006
 Groups in Geometry and Topology, Malaga, Spain, September 2006
 Groups of Diffeomorphisms 2006, Tokyo, Japan, September 2006
 Oberwolfach Topologie, Oberwolfach, Germany, September 2006
 ETH Zurich, November 2006
2007
 AWM Noether Lecture, New Orleans, LA, January 2007
 Conference on the Topology and Geometry of Moduli Spaces, Stanford, CA, January 2007
 Minicourse, Conference on Outer space, Luminy, France, February 2007
 Topology, Banff, Canada, February 2007
 Colloquium, University of Michigan, March 2007
 Topology/Geometry seminar, University of Chicago, May 2007
 Geometry and the Imagination, conference in honor of William P. Thurston's 60th birthday, Princeton, NJ, June 2007
 MSRI/Evans lecture, Berkeley, CA, September 2007
 Topology seminar, University of California, Berkeley, October 2007
 Topics in Geometric Group Theory, MSRI, Berkeley, CA November 2007
 UCSB Distinguished Lecturer (2 lectures), University of California at Santa Barbara, November 2007
 Winterschule (5 lectures), Goettingen, Germany, December 2007
2008
 Colloquium, McMaster University, Hamilton, Ontario, Canada, January 2008
 Colloquium, Stanford University, Stanford, CA, February 2008
 Colloquium, University of Texas, Austin, TX, March 2008
 Alaoglu Lecture, California Institute of Technology, Pasadena, CA, May 2008
 Workshop on Discrete Groups and Geometric Structures, Kortrijk, Belgium, May 2008
 Oberwolfach Topologie, Oberwolfach, Germany, September 2008
 WISEST lecture, University of Illinois at Chicago, October 2008
 Topology seminar, University of Illinois at Chicago, October 2008
2009
 Topology Seminar, Oxford University, Oxford, England, January 2009
 Talk to Lehman College scholarship students, Lehman College, New York NY February 2009
 Group Theory Seminar, CUNY graduate center, New York NY, February 2009
 Colloquium, Yale University, February 2009
 Spring Topology and Dynamics conference, Gainesville, FL, March 2009
 Geometry/Topology seminar, University of Illinois at Chicago, March 2009
 Colloquium, Brown University, April 2009
 Plenary address, AMS Spring Sectional Meeting, San Francisco, CA, April 2009
 Georgia Topoogy Conference, Athens, GA, May 2009
 Geometry and Topology, Münster Universität, Münster, Germany June 2009
 Davis 60: Geometric Group Theory, Bedlewo, Poland, June 2009
 Coloquio Brasileiro de Mathematica, Algebra session, IMPA, Rio de Janeiro, Brazil, August 2009
 William Rowan Hamlton workshop, Dublin, Ireland, September 2009
 Topology/Geometry seminar, University of Glasgow, Glasgow, Scotland, October 2009
 Colloquium, University of Münster, Münster, Germany, October 2009
 Topology Seminar, Oxford University, Oxford, England, November 2009
 12th NordrheinWestfalen Topology Meeting, Düsseldorf, Germany, November 2009
 Workshop on Rigidity, Hausdorff Institute for Mathematics, Bonn, Germany, November 2009
 Kolloquium, Karlsrühe University, Karlsrühe, Germany, December 2009
 Workshop on Geometric structures and geometric group theory, KIAS, Seoul, Korea, December 2009
 Special session, Joint KMSAMS meeting, Seoul, Korea, December 2009
2010
 Stanford Undergraduate Math Organization, Stanford, CA, January 2010
 Nebraska Conference for Undergraduate Women, Lincoln, NE, January 2010
 Felix Klein Lectures, Hausdorff Institute for Mathematics, Bonn, Germany, MayJune 2010
 Colloquium, Mathematics Institute, University of Warwick, Coventry, England, June 2010
 Workshop on Geometric Group Theory, Goa, India, August 2010
 Colloquium, Northwestern University, October 2010
 Topology Seminar, University of Chicago, October 2010
 Special Session on Combinatorics and Topology, AMS meeting, Syracuse, NY, October 2010
 Colloquium, University of Virginia, Charlottesville, VA, November 2010
2011
 Colloquium, Indiana University, Bloomington IN, February 2011
 Trjitnitsky Memorial Lectures, University of Illinois, UrbanaChampagne, February 2011
 Colloquium, University of Virginia, Charlottesville, VA, March 2011
 Colloquium, University of Tennessee, Knoxville, TN, April 2011
 Plenary Address, British Mathematical Colloquium, Leicester, England, April 2011
 Workshop on Coxeter groups, Artin groups, buildings and their automorphisms (3 lectures), Columbus, OH, April 2011
 Dynamics and Topology seminar, Marseilles, France, May 2011
 Journées d'inauguration de la Fondation mathématique Jacques Hadamard, Paris, France, May 2011
 Group Theory Day, Marseilles,France May 2011
 Geometric Group Theory conference, Haifa, Israel June 2011
 Plenary address, Dubrovnik VII  Geometic Topology conference, Dubrovnik, Croatia, June 2011
 British Topology Colloquium, Edinburgh, Scotland, August 2011
 European Math Society lectures at European Women in Mathematics meeting, Barcelona, Spain, September 2011
 Special session in Geometric Group Theory, AWM 40th Anniversary Celebration, Providence, RI September 2011
 Colloquium, Northwestern University, September 2011
 Colloquium, Tufts University, October 2011
 Colloquium, University of California, Berkeley, November 2011
 Colloquium, University of Rochester, Rochester, NY, December 2011
2012
 Tripode GrenobleLyonLyon, Lyon, France, January 2012
 Algebra Seminar, Cambridge University, Cambridge, England, February 2012
 European Math Society lectures, Oxford, England, February 2012
 Groups and Geometry in the Southeast, Oxford, England, February 2012
 Topology Seminar, University of Warwick, Warwick, England, February 2012
 Topology and algebra Seminar, Imperial College, London, England, February 2012
 European Math Society lectures, MittagLeffler Institute, Stockholm, Sweden, March 2012
 Groups 2012, Conference in honor of Bernd Fischer, Bielefeld, Germany, March 2012
 Colloquium, University of Copenhagen, Copenhagen, Denmark, April 2012
 Panorama of Topology, Conference in honor of William Browder, Princeton, New Jersey, May 2012
 Algebra and Geometry Seminar, KTH Stockholm, Sweden, May 2012
 von Neumann Conference, Muenster, Germany, May 2012
 Berlin Mathematical School Kovalevskaya Colloquium, Berlin, Germany, June 2012
 Topology and Groups Berlin Summer School (4 lectures), Freie Universitat Berlin, Berlin, Germany, June 2012
 Topology and Groups Berlin Conference, Freie Universitat Berlin, Berlin, Germany, June 2012
 Plenary Lecture, Young Mathematicians Conference, Ohio State University, Columbus, Ohio, July 2012
 Algebra Seminar, ETH Zurich, Zurich, Switzerland, October 2012
 Conference on Automorphisms of free groups: Algorithms, Geometry and Dynamics, Centre de Recerca Matematica, Barcelona, Spain, November 2012
 Cohomological methods in geometrid group theory (2 lectures), Banff, Canada, November 2012
2013
 Topology seminar, University of Warwick, Coventry, England, June 2013
 Conference on Interactions between low dimensional topology and mapping class groups, Max Planck Institute, Bonn, Germany, July 2013
 Workshop on the geometry of Outer space, Marseilles, France, July 2013
 Geometric Group Theory  Kyoto (2 lectures), Kyoto, Japan, July 2013
 Groups St. Andrews (4 lectures), St. Andrews, Scotland, UK, August 2013
 Geometric and cohomological Group Theory, ESPRC Durham Symposium, Durham, UK, August 2013
 William Rowan Hamilton Geometry and Topology Workshop, Dublin, Ireland, September 2013
 I.C.E.R.M. Research Seminar, Providence, RI, October 2013
 Geometry, Groups and Topology, Karlsruhe, Germany, October 2013
 Colloquium, Rice University,, Houston, TX, October 2013
 Colloquium, BrandeisHarvardMIT, Waltham, MA, November 2013



