| 02/2000-present | Lecturer for Environmental Toxicology and Environmental Hygiene at the Institute of Hygiene and Occupational Medicine at the University of Essen | |
| 02/2002 | Qualification as University lecturer (Habilitation procedure finished) | |
| 12/2000 | Habilitation thesis submitted | |
| 02/2000-present | Scientist at the University of Essen, Institute of Hygiene and Occupational Health, Head of the Division "In vitro- and Molecular Toxicology" | |
| 04/1999-02/2000 | Visiting scientist at the University of Essen, Institute of Hygiene and Occupational Health | |
| 04/1998-12/2000 | Habilitandin (german status to qualify as a university lecturer) Department of Biology, University of Rostock, Germany | |
| 10/1998-12/1998 | Visiting scientist at the University of Calgary, Department of Pathology, Canada | |
| 08/1995-12/1995 | Visiting scientist at the University of Riverside, Department of Entomology, USA | |
| 07/1994-08/1994 | Visiting scientist at the Marine Biological Laboratory, Woods Hole, MA, USA | |
| 10/1993-04/1998 | Post-doctoral research fellow at the Institute of Zoology, Department of Biology, University of Rostock, Germany | |
| 01/1993-10/1993 | Representative leader of a laboratory for micromanipulation and genom analysis of cattle embryos, Embryotransfer station (cattle) in Gnewitz (Mecklenburg/Vorpommern), Germany |