Since 2007	Head of Center for Geomicrobiology, University of Aarhus, Denmark.
Since 1993	• Professor, Dept. of Geology, University of Bremen. • Adjunct professor, Dept. of Biology, University of Aarhus, Denmark.
Since 1992	Director of the Max Planck Insitute for Marine Microbiology, Bremen, Germany.
1987-92	Research Professorship at the Danish Natural Science Research Council.
1984-85	Research Associateship at the National Research Council, USA.
1979	D. Sc. at the University of Aarhus. Doctoral Thesis: "The sulfur cycle of marine and hypersaline environments".
1977	Ph. D. in biology at the University of Aarhus.
1973	M. Sc. in biology at the University of Aarhus, Denmark.