Some upcoming or recurrent activities that I organize:

• Marc Burger's prime, FIM, ETH Zürich, Switzerland, 27 June -- 1 July 2022
• Geometry, dynamics and representations -- a conference in honor of François Labourie, Università della Corsica, Cargèse, Corsica, 6--10 June 2022
• goMATH, Frauen machen Mathematik, ETH, Switzerland, 14 March -- 25 March 2022
• Workshop Counting problems in Ventotene (LT), Italy, 6--11 September 2021, organized in collaboration with Martin Bridgeman (Boston College), Stefano Francaviglia (Università di Bologna), Roberto Frigerio (Università di Pisa) and Michah Sageev (Technion, Haifa).
• Conference in honor of Ursula Hamenstädt, Centro Stefano Franscini, Switzerland, 18 -- 23 July 2021
• Artin groups, CAT(0) geometry and related topics (CharneyFest), Ohio State University, Columbus, OH, USA, 5--9 July 2021
• Alice Roth Lectures
  
• Bernays Lectures
  
• Geometry seminar at ETHZ
• Graduate Colloquium, an activity of the "Zürich Graduate School"

Some miscellaneous older activities that I organized:

• Symplectic group theory reading seminar, ETH, Winter semester 02 (announcement)
  
• Conference Bounded Cohomology, Harmonic Maps and Higgs Bundles in Strasbourg 14--16 March 2005 and Basel 17--19 March 2005, organized in collaboration with Oliver Baues (Universität Karlsruhe), Olivier Biquard (Université de Strasbourg), Stefan Wenger (Universität Basel) and Anna Wienhard (Universität Basel).
• Seminar Higher Teichmüller theories, organized in collaboration with Sebastian Baader
• Workshop Geometric and Analytic Group Theory in Ventotene (LT), Italy, 9--14 September 2013, organized in collaboration with Gabriella Kuhn (University of Milano Bicocca) and Michah Sageev (Technion, Haifa).
• Introductory Workshop:Dynamics on Moduli Spaces of Geometric Structures, MSRI, 20--23 January 2015, organized in collaboration with Dick Canary (University of Michigan), Bill Goldman (University of Maryland) and Ursula Hamenstädt (Universität Bonn)
• Workshop Manifold and Groups in Ventotene (LT), Italy, 7--12 September 2015, organized in collaboration with Stefano Francaviglia (Università di Bologna), Roberto Frigerio (Università di Pisa), Kate Juschenko (Northwestern University), Gabriele Mondello (Università di Roma La Sapienza) and Michah Sageev (Technion, Haifa)
• Workshop Groups acting on CAT(0) spaces at MSRI, 27-30 September 2016, organized in collaboration with Pierre-Emmanuel Caprace (Université de Louvain), Koji Fujiwara (Kyoto University) and Michah Sageev (Technion, Haifa)
• Special semester Non-Positive Curvature Group Actions and Cohomology at the Isaac Newton Institute, Cambridge, UK, January 3rd--June 23rd, 2017, organized in collaboration with Goulnara Arzhantseva (Universität Wien), Cornelia Drutu (Oxford University) and Nicolas Monod (EPFL).
• Workshop Border-Crossing Workshop: Group action and cohomology in non-positive curvature at the Isaac Newton Institute, 19-23 June 2017, organized in collaboration with Mladen Bestvina (University of Utah), Brian Bowditch (University of Warwick) and Nicolas Monod (EPFL), in the context of the special semester "Non-Positive Curvature, Group Actions and Cohomology".
• Workshop Moduli Spaces in Ventotene (LT), Italy, 11--16 September 2017, organized in collaboration with Stefano Francaviglia (Università di Bologna), Roberto Frigerio (Università di Pisa), Kate Juschenko (Northwestern University) and Michah Sageev (Technion, Haifa).
• Workshop Borel seminar: Topology and Dynamics in the Swiss Alps in Les Diablerets (VD), Switzerland, 3-7 December 2018, organized in collaboration with Christoforos Neofytidis (Université de Génève) and Federico Rodriguez Hertz (Penn State University.
• goMATH, Frauen machen Mathematik, ETH, Switzerland, 11 -- 22 March 2019
• Workshop Of coarse! Quasi-isometries and groups: rigidity and classification in Ventotene (LT), Italy, 9--14 September 2019, organized in collaboration with Martin Bridgeman (Boston College), Anna Erschler (ENS), Stefano Francaviglia (Università di Bologna), Roberto Frigerio (Università di Pisa), Fanny Kassel (IHES & CNRS) and Michah Sageev (Technion, Haifa).
• Virtual geometric group theory conference, CIRM, Luminy, France, 1 -- 5 June 2020

Random miscellaneous links

• World clock
• Currency exchange
• Some help with English
• Some German
• Some English grammar
• Movies in Zürich: Kulturifo, Cineman , Xenix or Arthouse

From an even older Web page

• Some old courses I taught at the University of Maryland for which Web pages were available (that is most, if not all, courses taught since Spring 1996).
• Some old and not particularly nice pictures