| Date | Position | Institution |
| 1973 -1982 | Scientific Assistant
(Wissenschaftlicher Assistent) | Institut für Ökonometrie und
Operations Research, Universität Bonn |
| 1982 -1991 | Full Professor of
Applied Mathematics | Institut für Mathematik, Universität Augsburg |
| since 1991 | Full Professor of
Information Technology | Institut für Mathematik, Technische Universität Berlin |
| | and | |
| | Vice President | Konrad-Zuse-Zentrum für
Informationstechnik Berlin (ZIB) |
| 2002 - 05/2008 | Chair | DFG Research Center Matheon "Mathematics for key technologies" (at TU Berlin),
funded by the Deutsche Forschungsgemeinschaft (German Research Foundation) |
| 2002 - 03/2009 | Member of Executive Board | DFG Research Center
Matheon |
