| 2000 - present | employed at IPN |
| 1998 - 2000 | Scientific Researcher at the WHO Collaborating Centre for Research on Drinking-water Hygiene of the Federal Environmental Agency, Berlin |
| 1992 - 1996 | Scientific Researcher at the Institute of Hydrobiology and Fisheries Sciences, Hamburg University |
| 1986 - 2000 | Scientific Publisher and Author (Freelancer)
Expert and Adviser on Fisheries Sciences (Freelancer)
Expert on Public Relations (Freelancer)
Final Editor (Freelancer) |
| 1985 - 1992 | Final Editor at the weekly paper DIE ZEIT, Hamburg |
