| • | 1989 | PhD (Dr.rer.nat.), Univ. Erlangen-Nürnberg |
| • | 1993 | Habilitation, Univ. Erlangen-Nürnberg |
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| • | 1989-1990 | Oberassistent Univ. Zürich |
| • | 1990-1995 | PostDoc Univ. Erlangen-Nürnberg |
| • | 1995-1996 | Visiting Professor Univ. Bonn |
| • | 1996-1997 | PostDoc MPI Leipzig |
| • | Since 1997 | Professor Univ. Bonn |
| • | 2006 | Offer of Chair in Pure Mathematics, Imperial College London (declined) |
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| • | 2007-2010 | Managing Director of Institute for Applied Mathematics, Univ. Bonn |
| • | Since 2002 | Vice Chairman of Collaborative Research Center SFB 611, Bonn |
| • | Since 2010 | Member of the Board of Directors, Hausdorff Center for Mathematics, Bonn |