| 1979 - 1984 |
Student assistant at Institute of Geology at Muenster University |
| 1981 - 1984 |
Graduate assistant at Essen University |
| 1984 |
Post doc at California State University, Long Beach, USA |
| 1984 - 1986 |
Scientist at Essen University |
| 1986 - 1992 |
Assistant Professor at Essen University |
| 1986 |
Research stay in Australia, Geological Survey W.A., Perth and Kalgoorlic |
| 1987 |
Research stay at Rand Afrikaans University, Johannisburg, South-Afrika (founded by Heinrich Hertz-Foundation) |
| 1988 - 1992 |
Scientifc Editor of the Journal GEOWISSENSCHAFTEN, VCH Weinheim |
| 1990 |
Research stay at harvad University, Boston, USA (founded by Heinrich Hertz-Foundation) |
| 1991 - 1992 |
Scientifc lectorate GEOWISSENSCHAFTEN, Akademic Publisher, Berlin |
| 1992 - 1993 |
Senior Scientist at Essn University |
| 1993 - 2001 |
Secretary General of the German Council of Environmental Advisors at the Ministry for Environment, Nature Conservation, and Nuclear Safety |
| 1993 - 1998 |
Research and Teaching at Essen University |
| 1994 |
Appointment as Director and Professor |
| 1998 - 2001 |
Research and Teaching at Johannes Gutenberg University, mainz, Institute for Applied Geology
|
| since 2001 |
Director of the Leibniz-Centre for Agricultural Landscape Research (ZALF) Muencheberg |
| 2001 |
Appoinment as Professor for Geoecology at Potsdam University |