since 2011
Professor of Analytical Chemistry, University of Leipzig 
Head of the Department of Analytical Chemistry of the UFZ
2009
Associate Professor of Environmental Chemistry at TU Berlin
2006-2010
Federal Institute for Risk Assessment (BfR, Berlin) 
Head of Unit 81 "Contaminants in the Food Chain" 
Head of the "National Reference Laboratory for Dioxins and PCB in Feed and Food" 
Coordinator of the Department "Chemicals Safety" 
Deputy of Unit 67 "Residue Analysis of Pesticides"
2003-2006
Senior Researcher at the Department of Water Quality Control of TU Berlin
2001-2003
Scientific Manager of the Research Centre "Water in Urban Areas" of TU Berlin
2002
Habilitation in "Environmental Chemistry"
1995-2001
Senior Researcher at the Department of Water Quality Control of TU Berlin
1991-1994
Ph.D. thesis (Prof. Dr. Martin Jekel) at the Department of Water Quality Control of Technical University of Berlin (TU Berlin)
1988-1990
Pre-doctoral Researcher at the Institute of Biogeochemistry (Prof. E.T. Degens, Prof. Dr. Venugopalan Ittekkot), University of Hamburg
1988
Diploma in Chemistry, University of Hamburg