| 1974 - 1975 | South America (6 months), Instruction of Paraguayan teachers, Swiss developmental aid program |
| 1975 - 1976 | University of Zürich, Assistant at the Zoological Institute |
| 1977 - 1978 | Australian National University, Canberra. Postdoctoral Fellowship, Neurobiology Department |
| 1978 - 1980 | University of California, Berkeley. Department of Entomological Sciences, Division of Biological Control |
| 1981 - 1984 | University of Basel, Switzerland. Teaching, Research and Habilitation at the Zoological Institute |
| 1983 | Venia legendi for Zoology at the University of Basel |
| 1984 - 1990 | Swiss Federal Institute for Forest, Snow and Landscape Research, WSL Birmensdorf (Zürich) Continued teaching at the University of Basel |
| 1991 - 1998 | WSL Birmensdorf: Head of section Zoology |
| 1998 - 2008 | Titulary professor for zoology |
| 1999 - 2006 | Head of section “Biodiversity” at WSL Birmensdorf |
| 2006 - 2008 | Senior Scientist |
| 2008 - | Retired - but still active... |