CURRICULUM VITAE - Karen Vogtmann

Professor of Mathematics
University of Warwick

Goldwin Smith Professor of Mathematics Emeritus
Cornell University
Current address  
 

Mathematics Institute
Zeeman Building
University of Warwick
Coventry CV4 7AL
UK

Office: C2.05
Phone: +44 (0)2476 53 27 39
Email: 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
  • Low-dimensional topology
  • Cohomology of groups
Employment history  

 

 

 

 
  • University of Warwick, Professor, 9/13 to present
  • Cornell University
        Goldwin Smith Professor of Mathematics Emeritus, 7/15 to present
        Goldwin Smith Professor of Mathematics, 7/11 to 7/15
        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  

 

 

 

 

 
  • Newton Institute, Cambridge, UK, 3/17 to 5/17
  • Mathematical Sciences Research Institute, Berkeley, CA 8/16 to 12/16
  • Research Professor, ICERM, Providence, RI, 9/13 to 12/13
  • Freie Universität Berlin, Berlin, Germany, 6/12
  • Mittag-Leffler 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 5/10-8/10
  • Mathematical Sciences Research Institute, Berkeley, 8/07 to 12/07
  • I.H.E.S., Bures-sur-Yvette, France 3/04
  • Professeur Invit´e, Marseilles, France, 3/00
  • Mathematical Sciences Research Institute, Berkeley, 1/95 to 7/95
  • I.H.E.S., Bures-sur-Yvette, France, 1/92-8/93
  • Chercheur, C.N.R.S., E.N.S. de Lyon, France, 9/92-12/92
  • 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
Honors and Awards  

 

 

 

 
  • Pólya Prize, London Math Society, 2018
  • Honorary Doctorate, University of Copenhagen, 2017
  • Simons Professor, Newton Institute, Spring 2017
  • Simons Professor, M.S.R.I. Fall 2016
  • Plenary Lecture, European Congress July 2016
  • Clay Senior Scholar award, 2016
  • Humboldt Research Prize, 2014
  • Royal Society Wolfson Research Merit Award, 2014
  • Fellow of the American Mathematical Society, 2013
  • European Math Society Lecturer, 2011
  • AWM Noether Lecturer, 2007
  • ICM speaker, Topology section, 2006
  • National Science Foundation Career Advancement Award, 1989
  • National Science Foundation grants for research in mathematics 1978-79, 1983-2014
Ph.D. Students  

 

 
  • Thomas Brady (1988)
  • Martin Bridson (1991)
  • Debra Boutin (1998)
  • Craig Jensen (1998)
  • Lisa Orlandi-Korner (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 Board, Berlin Mathematical School, (2015 - )
  • Conseil Scientifique Extérieur, MILYON (2012 - )
  • Scientific Advisory Committee, International Summer School of Mathematics for Young Students (2012- )
  • Steering Committee, Park City Mathematics Institute (2010-2014 )
  • Board on Mathematical Sciences and Their Applications of the National Academies (2010- 2013)
  • U.S. National Committee for Mathematics (2009-2016)
  • Research Advisory Panel, Mathematics, Simons Foundation (2011)
  • Scientific Advisory Committee of the Mathematical Sciences Research Institute (2006-2010)
  • ArXiv Advisory Board (2004-2016)
  • Scientific Research Board of the American Institute of Mathematics (1998-2005)

    • Editorial Boards
  • Editorial Board, Geometry and Topology Monographs (2013- )
  • Consulting Editor, Proceedings of the Edinburgh Math Society (2012- )
  • Associate Editor, Journal of the AMS (2010-2018)
  • Editorial Board, Algebraic and Geometric Topology, (2006 - 2016)
  • Associate Editor, Research/Expository surveys, Bulletin of the A.M.S. (1998-2000)

    • American Mathematical Society
  • Board of Trustees, American Mathematical Society (2008-2018 (chairman 2011 and 2016))
  • Vice President, American Mathematical Society, (2003-2006)
  • AMS Committee on Education (2003-2006)
  • AMS delegate to ICIAM board (May 2005)
  • Executive Committee, American Mathematical Society (1999-2003)
  • AMS Committee on Meetings and Conferences (1997-2003), chairman (2000-2003)
  • Member-at-Large, Council of the AMS (1997-2000)
  • AMS Fellowship Committee 1989-90 (chairman 1990)

    • External Review Panels
  • External review panel, ETH Zurich, 2015
  • 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
  • UUK Working Group on Repositories, 2017-2018
  • 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 (2007-2008)
  • Vietnam Education Foundation mathematics panel (June 2005)
  • Selection committee, NSF graduate fellowships in Mathematics, 1994, 1996-99 (chairman1999)
  • Selection committee, Gehman lectures, Seaway section of the MAA, 1997
  • AWM Noether Lecturer selection committee 1991-1993 (chairman 1993)
  • Reviewer, Math Reviews 1977-1990
  • Served on numerous panels at the National Science Foundation
  • Referee for numerous professional journals
Conferences, programs and workshops organized  

 

 

 

 

 

 
  • (with I. Chatterji and L. Paris) Workshop on Artin Groups, CAT(0) Geometry and Related Topics, CIRM, Luminy, France, June 2020
  • (with R. Charney) Workshop on the geometry of outer automorphism groups and outer spaces, University of Warwick, April 2018
  • (with B. Bowditch, C. Leininger, S. Schleimer and J. Smillie) Warwick Symposium on Geometry, topology and dynamics in low dimensions, Sept 2017- June 2018
  • (with M. Bridson, L. Kramer, B. Remy) Geometric group theory, Oberwolfach, July 2017
  • (with I. Agol, M. Bestvina, C. Drutu, M. Feighn, M. Sageev) Geometric Group Theory, M.S.R.I. Jumbo program, Fall 2016
  • (with M. Bridson, B. Farb, Z. Sela) Introductory workshop, Geometric Group Theory, M.S.R.I., September 2016
  • (with M. Bestvina, T. Delzant, D. Gaboriau, F. Paulin (Scientific committee)) Impact of geometric group theory, C.I.R.M. Luminy, July 2015
  • (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. Witte-Morris) 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, 1986-2012
  • (with M. Bridson, M. Bucher-Karlsson, A. Karlsson, T. Smirnova-Nagnibeda) Geometric and Analytic Methods in Group Theory, Mittag-Leffler 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) Non-positive 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 27-31 2007
  • (with R. Charney and I. Chatterji) Connections for Women: Classics of Geometric Group Theory, M.S.R.I., Berkeley, CA August 23-24, 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, C-L 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  
  1. Homology Stability for On,n, Comm. Alg., 7 (1979), no.1., 9-38.
  2. Spherical Posets and homology stability for On,n, Topology 20 (1981), 119-132.
  3. A Stieffel complex for the orthogonal group of a field, Comment. Math. Helv. 57 (1982), no.1, 11-21.
  4. The integral homology of SL2 and PSL2 over Euclidean imaginary quadratic integers, (with J. Schwermer) Comment. Math. Helv. 58 (1983) no.4, 573-598.
  5. Rational homology of Bianchi groups, Math. Ann. 272 (1985), 399-419.
  6. Moduli of graphs and automorphisms of free groups, (with M. Culler) Inventionnes 84 (1986), 91-119.
  7. A generating function for the Euler characteristic of Out(Fn), (with J. Smillie) J. Pure and Appl. Algebra 44 (1987), 329-348.
  8. Automorphisms of graphs, p-subgroups of Out(Fn) and the Euler characteristic of Out(Fn), (with J. Smillie) J. Pure and Appl. Algebra 49 (1987), 187-200.
  9. Local structure of some Out(Fn)-complexes, Proc. Edinburgh Math Soc. 33 (1990), 367-379.
  10. The boundary of outer space in rank two, (with M. Culler) in Arboreal Group Theory (R. Alperin, ed) New York: Springer-Verlag (1991) 189-229.
  11. Automorphisms of SL2 of imaginary quadratic integers, (with J. Smillie) Proc. A.M.S.112 (1991) no. 3
  12. Equivariant Outer space and automorphisms of free-by-finite groups (with S. Krstic),Comment. Math. Helvetici 68 (1993) 216-262.
  13. Length functions and outer space (with J. Smillie), Michigan Math J. 39 (1992) 485-493.
  14. End invariants of the group of outer automorphisms of a free group, Topology 14 (1995) no. 3, 533-545.
  15. Isoperimetric inequalities for automorphism groups of free groups (with A. Hatcher), Pacific J. Math. 173 (1996), no. 2, 425-441.
  16. On the geometry of the group of automorphisms of a free group (with M. Bridson), Bull. London Math. Soc. 27 (1995), 544-552.
  17. A group-theoretic criterion for property FA (with M. Culler), Proc. Amer. Math. Soc. 124 (1996), no. 3, 677-683
  18. Cerf theory for graphs (with A. Hatcher), J. London Math. Soc., 58, part 3 (1998), 633-655.
  19. The complex of free factors of a free group (with A. Hatcher), Quart. J. Math. Oxford Ser. (2) 49 (1998), no. 196, 459–468.
  20. Rational homology of Aut(Fn) (with A. Hatcher), Mathematical Research Letters 5 (1998), 759-780.
  21. 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), 117-141.
  22. A Whitehead algorithm for surface groups (with G. Levitt), Topology 39 (2000), no. 6, 1239–1251.
  23. The symmetries of Outer space (with M. R. Bridson), Duke Math Journal 106 (2001), 391–409.
  24. Automorphisms of automorphism groups of free groups (with M. R. Bridson), J. Algebra 229 (2000), no. 2, 785–792.
  25. Geometry of the space of phylogenetic trees (with L. Billera and S. Holmes), Advances in Applied Math 27 (2001), 733-767.
  26. 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.
  27. Homomorphisms from automorphism groups of free groups, (with Martin R. Bridson), Bull. London Math. Soc. 35 (2003), no. 6, 785–792.
  28. Infinitesimal operations on graph complexes, (with James Conant), Math. Ann. 327 (2003), 545–573.
  29. On a theorem of Kontsevich, (with Jim Conant), Algebr. Geom. Topol. 3 (2003) 1167-1224.
  30. Cut vertices in commutative graphs, (with James Conant and Ferenc Gerlits), Quart. J. Math 56(3) (2005), 321-336.
  31. Morita classes in the homology of automorphism groups of free groups, (with Jim Conant), Geom. Topol. 8 (2004), 1471-1499.
  32. Homology stability for outer automorphism groups of free groups, (with Allen Hatcher), Algebr. Geom. Topol. 4 (2004), 1253-1272.
  33. Erratum to: homology stability for outer automorphism groups of free groups, (with Allen Hatcher and Nathalie Wahl), Algebr. Geom. Topol. 20 (2006), 573-579.
  34. 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, 301-316.
  35. The cohomology of automorphism groups of free groups, Proceedings of the International Congress of Mathematicians, Madrid 2006, EMS, Zurich, Switzerland, 1101-1119.
  36. Morita classes in the homology of Aut(F_n) vanish after one stabilization, (with James Conant), Groups, Geometry and Dynamics 2 (1) (2008) 121-138
  37. Automorphisms of two -dimensional right-angled Artin groups, (with John Crisp and Ruth Charney), Geometry & Topology 11 (2007) 2227-2264.
  38. Automorphism groups of right-angled Artin Groups, Guido's book of conjectures, L'Enseignement Mathematiques Monographie No. 40, 2008.
  39. A presentation for Aut(F_n), (with Heather Armstrong and Bradley Forrest), to J. of Group Theory 11 (2008), 267-276.
  40. Finiteness properties of automorphism groups of right-angled Artin groups (with Ruth Charney), Bull. London Math. Soc. (41) February (2009) 94 - 102.
  41. What is Outer space?, Notices of the AMS 55, No. 7 (2008) 784-786.
  42. Automorphisms of two-dimensional RAAGs and partially symmetric automorphisms of free groups (with K.-U. Bux and R. Charney), Groups, Geometry and Dynamics 3 (4) (2009) 541–554
  43. Actions of automorphism groups of free groups on spheres and acyclic manifolds (with Martin Bridson), Commentarii Math. Helv. 86 (1) (2011)
  44. Subgroups and quotients of automorphism groups of RAAGs (with R. Charney), in
    Low-dimensional and Symplectic Topology - Proceedings of Symposia in Pure and Applied Math., Michael Usher ed University of Georgia, Editor - AMS, 2011.
  45. Abelian covers of graphs and maps between outer automorphisms of free groups (with M. R. Bridson), Math. Ann. 353 (2012), no. 4, 1069–1102.
  46. 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. 1811-1817
  47. 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): 119-153.
  48. Introduction (with M. Bestvina and M. Sageev), Geometric group theory, 1-5, IAS/Park City Math. Ser., 21, Amer. Math. Soc., Providence, RI, 2014.
  49. Actions of arithmetic groups on homology spheres and acyclic homology manifolds, (with M.R. Bridson and F. Grunewald), Math. Z. 276 (2014), no. 1-2, 387-395.
  50. Higher hairy graph homology, (with J. Conant and M. Kassabov), Geometriae Dedicata 176 (2015), 345-374.
  51. GL(n, Z), Out(Fn) and everything in between: automorphism groups of RAAGs, London Mathematical Society Lecture Note Series 422: Groups St Andrews 2013, 105-127, Cambridge University Press, 2015.
  52. On the geometry of Outer space, Bull. Amer. Math. Soc (N.S.) 52 (2015), no. 1, 27-46.
  53. The topology and geometry of automorphism groups of free groups, arXiv:1610.08545, to appear in Proceedings of the European Congress of Mathematics 2016
  54. Assembling homology classes in automorphism groups of free groups(with J.Conant, A.Hatcher and M.Kassabov), Commentarii Math. Helv. 91 (2016), 751-806.
  55. Outer space for untwisted automorphisms of right-angled Artin groups, (with R. Charney and Nathaniel Stambaugh), Geom. Topol. 21 (2017), no. 2, 1131–1178.
  56. Contractibility of Outer space:reprise, Hyperbolic Geometry and Geometric Group Theory, Advanced Studies in Pure Mathematics 73 (2017), Math. Soc. Japan, 265-280
  57. Tethers and homology stability for surfaces (with A. Hatcher), Algebr. Geom. Topol. 17 (2017), no. 3, 1871-1916.
  58. On the bordification of Outer space(with K.-U. Bux and P. Smillie), to appear in J. London Math. Soc.
Ten invited addresses  
 
  1. International Congress of Mathematicians, Madrid, Spain, August 2006
  2. AWM Noether Lecture, New Orleans, LA, January 2007
  3. Geometry and the Imagination, conference in honor of William P. Thurston's 60th birthday, Princeton, NJ, June 2007
  4. Plenary address, AMS Spring Sectional Meeting, San Francisco, CA, April 2009
  5. Felix Klein Lectures, Hausdorff Institute for Mathematics, Bonn, Germany, May-June 2010
  6. Plenary Address, British Mathematical Colloquium, Leicester, England, April 2011
  7. 2011 European Math Society Lectures (Barcelona, Oxford, Stockholm)
  8. Panorama of Topology, Conference in honor of William Browder, Princeton, New Jersey, May 2012
  9. Keynote Lecture, Jahrestagung der Deutschn Mathematiker-Vereingung, Hamburg, Germany, September 2015
  10. Plenary Lecture, 7th European Congress of Mathematics, Berlin, Germany, July 2016
All invited lectures 2012 - present  
 

    2012

  1. Tripode Grenoble-Lyon-Lyon, Lyon, France, January 2012
  2. Algebra Seminar, Cambridge University, Cambridge, England, February 2012
  3. European Math Society lectures, Oxford, England, February 2012
  4. Groups and Geometry in the Southeast, Oxford, England, February 2012
  5. Topology Seminar, University of Warwick, Warwick, England, February 2012
  6. Topology and algebra Seminar, Imperial College, London, England, February 2012
  7. European Math Society lectures, Mittag-Leffler Institute, Stockholm, Sweden, March 2012
  8. Groups 2012, Conference in honor of Bernd Fischer, Bielefeld, Germany, March 2012
  9. Colloquium, University of Copenhagen, Copenhagen, Denmark, April 2012
  10. Panorama of Topology, Conference in honor of William Browder, Princeton, New Jersey, May 2012
  11. Algebra and Geometry Seminar, KTH Stockholm, Sweden, May 2012
  12. von Neumann Conference, Muenster, Germany, May 2012
  13. Berlin Mathematical School Kovalevskaya Colloquium, Berlin, Germany, June 2012
  14. Topology and Groups Berlin Summer School (4 lectures), Freie Universitat Berlin, Berlin, Germany, June 2012
  15. Topology and Groups Berlin Conference, Freie Universitat Berlin, Berlin, Germany, June 2012
  16. Plenary Lecture, Young Mathematicians Conference, Ohio State University, Columbus, Ohio, July 2012
  17. Algebra Seminar, ETH Zurich, Zurich, Switzerland, October 2012
  18. Conference on Automorphisms of free groups: Algorithms, Geometry and Dynamics, Centre de Recerca Matematica, Barcelona, Spain, November 2012
  19. Cohomological methods in geometrid group theory (2 lectures), Banff, Canada, November 2012

    20. 2013

  20. Topology seminar, University of Warwick, Coventry, England, June 2013
  21. Conference on Interactions between low dimensional topology and mapping class groups, Max Planck Institute, Bonn, Germany, July 2013
  22. Workshop on the geometry of Outer space, Marseilles, France, July 2013
  23. Geometric Group Theory - Kyoto (2 lectures), Kyoto, Japan, July 2013
  24. Groups St. Andrews (4 lectures), St. Andrews, Scotland, UK, August 2013
  25. Geometric and cohomological Group Theory, ESPRC Durham Symposium, Durham, UK, August 2013
  26. William Rowan Hamilton Geometry and Topology Workshop, Dublin, Ireland, September 2013
  27. I.C.E.R.M. Research Seminar, Providence, RI, October 2013
  28. Geometry, Groups and Topology, Karlsruhe, Germany, October 2013
  29. Colloquium, Rice University, October 2013
  30. Colloquium, Brandeis-Harvard-MIT, Waltham, MA, November 2013

    31. 2014

  31. Current Events Bulletin, Joint Mathematics Meetings, Baltimore, MD, January 2014
  32. Asymptotic Properties of Groups, IHP, Paris, France, March 2014
  33. Topology Seminar, University of Copenhagen, Copenhagen, Denmark, March 2014
  34. Topology Seminar, Oxford University, Oxford, UK, April 2014
  35. Discrete Groups and Geometric Structures, Leuven, Belgium, June 2014
  36. Hyperbolic Geometry and Geometric Group Theory, (3 lectures) Math Society of Japan, Tokyo, Japan, July 2014
  37. Geometry on Groups and Spaces, ICM satellite conference, Daejeon, Korea, August 2014
  38. Vector Bundles and Algebraic Geometry, Freie Universitat, Berlin, Germany, September 2014
  39. Topology seminar, K.T.H., Stockholm, Sweden, October 2014
  40. Mathematical Physics Seminar, Cardiff University, Cardiff, Wales, October 2014
  41. Colloquium, University of Bristol, Bristol, UK, October 2014

    42. 2015

  42. Minicourse (3 lectures), Perspectives in Lie theory program, Centro di Ricerca Matematica Ennio De Giorgi, Pisa, Italy, February 2015
  43. Geometry seminar, Cambridge University, United Kingdom, March 2015
  44. Topology seminar, University of Muenster, Germany, March 2015
  45. Main speaker (3 lectures), Journees trans-Couesnon de theorie des groupes, Caen, France, March 2015
  46. Colloquium, Southampton University, United Kingdom, April 2015
  47. Workshop on mapping class groups and Out(F_n), Austin, TX, May 2015
  48. Geometric Topology, Geometric Group Theory & Dynamical Systems, Dubrovnik, Croatia, June 2015
  49. Brussels-London Geometry seminar, University College London, September 2015
  50. Keynote Lecture, Jahrestagung der Deutschn Mathematiker-Vereingung, Hamburg, Germany, September 2015
  51. SFB Seminar, Berlin, Germany, October 2015
  52. Workshop on outer automorphisms of free groups (2 lectures), University of Copenhagen, Copenhagen, Denmark, November 2015
  53. Tech topology conference, Georgia Institute of Technology, Athens, GA, USA, December 2015
  54. Topology seminar, University of Grenoble, Grenoble, France December 2015

    55. 2016

  55. Colloquium, University of Sheffield, Sheffield, UK, February 2016
  56. Young Geometric Group Theory workshop (4 lectures), Karlsruhe, Germany, February 2016
  57. North British Geometric Group Theory Seminar, Edinburgh, UK, March 2016
  58. Topological and Homological Methods in Group Theory, Bielefeld, Germany, April 2016
  59. Geometry of Groups in Montevideo (3 lectures), Montivedeo, Uruguay, April 2016
  60. Topology seminar, Oxford University, Oxford, UK, May 2016
  61. Effective and Algorithmic Methods in Hyperbolic Geometry and Free Groups, ICERM, Providence, RI, USA, May 2016
  62. Colloquium, Jussieu, Paris, France, May 2016
  63. Conference on the Cohomology of Arithmetic Groups on the occasion of Joachim Schwermer's 66th birthday, Bonn, Germany, June 2016
  64. Topology of manifolds: a conference in honour of Michael Weiss' 60th birthday, Lisbon, Portugal, June 2016
  65. Plenary Lecture, 7th European Congress of Mathematics, Berlin, Germany, July 2016
  66. Algebraic, Topological and Combinatorial Approaches to Aut(Fn) (3 lectures), Technion, Haifa, Israel July 2016
  67. Geometry seminar, U. of California, Davis, October 2016
  68. Colloquium, U. of California, Berkeley, October 2016
  69. Mapping class group and Out(Fn) workshop, MSRI, October 2016
  70. Faces of Groups: a conference in honor of Alex Lubotzky’s 60th birthday, Jerusalem, Israel, November 2016
  71. Colloquium, Stanford University, December 2016

    72. 2017

  72. Topology seminar, Aberdeen, UK, January 2017
  73. Hot Topics workshop on Galois theory of periods and their applications, M.S.R.I., Berkeley, CA, USA, March 2017
  74. Non-positive curvature seminar, Newton Institute, Cambridge, UK, April 2017
  75. Workshop on braids in algebra, geometry and topology, Edinburgh, UK, May 2017
  76. Georgia Topology Conference, Atlanta, GA, May 2017
  77. Groups, manifolds and K-theory, a conference on the occasion of Wolfgang Lueck's 60th birthday, Muenster, Germany, June 2017
  78. Group actions and cohomology in non-positive curvature, Isaac Newton Institute, Cambridge, England, June 2017
  79. Geometric and Asymptotic Group Theory with Applications, Bilbao, Spain, July 2017
  80. Ventotene International Workshops: Moduli Spaces (3 lectures), Ventotene, Italy, September 2017
  81. Geometry and analysis on groups seminar, University of Vienna, Vienna, Austria, October 2017
  82. Oberwolfach seminar on Algebraic K- and L-theory and geometric group theory (5 lectures), Oberwolfach, Germany, October 2017
  83. Minicourse on the Lie algebra of symplectic derivations (4 lectures), University of Geneva, Geneva, Switzerland, November 2017
  84. Colloquium, University of Copenhagen, Copenhagen, Denmark, November 2017
  85. Groups in Madrid, Universidad Autonoma de Madrid, Spain, November 2017
  86. Weinachts workshop, Saarbrucken, Germany, December 2017

    87. 2018

  87. Colloquium, SISSA, Trieste, Italy, April 2018
  88. Workshop on automorphism groups of RAAGs (2 lectures), University of Paris, Orsay, France, May 2018
  89. Groups and Geometry in the Southeast, University of Warwick, Coventry, UK, June 2018
  90. Structures in Local Quantum Field Theory, Les Houches, Switzerland, June 2018
  91. International Conference on Manifolds, Groups and Homotopy, Isle of Skye, UK, June 2018
  92. Journée de la fédération Normandie Mathématiques, Caen, France, June 2018

    93. Invitations accepted

  93. Wasatch Topology Conference, Utah, USA, August 2018
  94. Groups, Geometry and Representations, Oxford, UK, September 2018
  95. CGTA launch conference, Southampton, UK, September 2018
  96. GdR Topologie Algébrique et Applications, Montpellier, France, October 2018
  97. Conference in honor of Alain Valette, IHES, Bures-sur-Yvette, France, December 2018
  98. Groups, spaces and geometries on the occasion of Alessandra Iozzi's 60th birthday, ETH, Zurich, Switzerland, January 2019
  99. GAGTA, Tel Aviv, Israel, May 2019
  100. Aspects of Non-Positive and Negative Curvature in Group Theory, CIRM, Luminy, France, June 2019
  101. 10 years with SYM in Copenhagen, Copenhagen, Denmark, June 2019