Activity as editor

Besides Christian Ausoni, Kathryn Hess, Brenda Johnson, Jerome Scherer I am one of the editors of the proceedings of Fourth Arolla Conference on Algebraic Topology 2012
From January 2007 to December 2012 I was an editor of the journal Journal of Topology (LMS).
From July 2007 to December 2012 I was an editor of the journal Münster Journal of Mathematics .
From May 2006 to December 2012 I was an editor of the journal Groups, Geometry and Dynamics (European Mathematical Society Publishing House).
From July 2005 to December 2008 I was an editor of the electronic journal Geometry and Topology .
From January 2004 to August 2008 I was the managing editor of the Journal Mathematische Annalen (Springer).
From November 2003 to August 2008 I was one of the editors of the Journal Commentarii Mathematici Helvetici (European Mathematical Society Publishing House).
From August 2007 to December 2007 I was an interim editor of the journal K-Theory. For information about K-Theory versus Journal of K-Theory I refer to the following article for the DMV-Mitteilungen including a letter by Prof. Matthias Kreck pdf (German) pdf (English)
From 2002 to December 2006 I was one of the editors of the Journal Topology (Elsevier).
Tom Farrell (Binghamton), Lothar Göttsche (Trieste) and I are the editors of the Proceedings of the School / Conference ``High-dimensional manifold theory'' which took place in Trieste, in May and June 2001.
Together with M.Farber (Tel Aviv) and S. Weinberger (Chicago) I am one of the editors of the Proceedings ``Tel Aviv Topology Conference: Rothenberg Festschrift'', international conference on topology, June 1-5, 1998, Tel Aviv, Contemporary Mathematics 231 (1999).
From 1997 to August 2008 I was one of the editors of the Journal Mathematische Annalen (Springer).

Further Activities

From October 2019 until September 2022 I was the spokesman of the cluster of excellence Hausdorff Center for Mathematics
From January 2014 until June 2021 I was the chairman of the scientific advisory board of the Mathematische Forschungsinstitut Oberwolfach
In 2014 I was a member of the Auswahlkommission für die Doktorandenförderung Deutschen Telekom Stiftung
From 2013 to 2021 I was a member of the Nominierungsausschuss für das Gottfried Wilhelm-Leibniz-Programm
Since March 2013 I am a member of the Nordrhein-Westfälische Akademie der Wissenschaften und Künste
From January 2013 to December 2022 I was a Max-Planck-fellow associated to the Max Planck-Institute for Mathematics at Bonn
From October 2011 to September 2017 I was the director of the HIM (Hausdorff Research Institute for Mathematics)
Since May 2010 I am a member of the Leopoldina (Nationale Akademie der Wissenschaften)
From 2008 to 2012 I was a member of the Fachkollegium of the Deutsche Forschungsgemeinschaft
From October 2007 to October 2013 I was a member of the scientific committee of the Mathematische Forschungsinstitut Oberwolfach
From January 2009 to December 2010 I was the president of the Deutsche Mathematiker Vereinigung.
From July 1-rst, 2010 to September 30-th, 2010 I was the coordinator of the collaborative research center Groups, Geometry and Actions
From January 2007 to December 2009 I have been a member of the Auswahlausschuss of the Feodor Lynen-Stipendiumsprogramm der Alexander von Humboldt-Stiftung
From January 2006 to December 2008 I was the vice president of the Deutsche Mathematiker Vereinigung.
From 2000 to 2009 I have been the speaker of the Graduiertenkolleg "Analytische Topologie und Metageometrie"
From 1998 to 2001 I was a member of the committee of the Bundeswettbewerb Mathematik.
From 1997 to 2009 I have been one of the two vice-speakers of the Sonderforschungsbereich 478 "Geometrische Strukturen in der Mathematik."