Born 1963. Studies of Mathematics with Diplom 1988 and PhD 1992 at the University of Mainz, advised by Matthias Kreck. Scientific Assistant, University of Mainz 1990-1992 and 1995-1996. Feodor-Lynen Fellowship (Humboldt Stiftung), University of California, San Diego 1992-1995 with Michael Freedman. Miller Research Fellow, UC Berkeley 1996-1997. Associate Professor, UC San Diego 1996-1999. Full Professor, UC San Diego 1999-2004. Full Professor, UC Berkeley since 2004. Scientific Member and Director, MPI for Mathematics since 2008.