| 1971-1980 |
Professor of Inorganic Chemistry, Johann-Wolfgang-Goethe University, Frankfurt (Main) |
| 1973-1976 |
Director at the Insititute Inorganic Chemistry, Johann-Wolfgang-Goethe University Frankfurt (Main) |
| 1980- |
Professor and Director at the Institute of Inorganic Chemistry, Georg-August-University Göttingen |
| 1984 |
Visiting Professor at the University of Auburn, USA |
| 1985-1987 |
Dean of the Faculty of Chemistry of the Georg-August-University Göttingen |
| 1987 |
Visiting Professor at the Tokyo Institute of Technology, Japan |
| 1992 |
Visiting Professor at the University of Kyoto, Japan |
| 1995 |
George and Pauline Watt Centennial Lecturer, University of Texas at Austin, USA |
| 1995 |
Frontier Lecturer, Texas A&M University, College Station, Texas, USA |