Since 07/2007	Leader of Research Group on Biogeochemistry, MPI Bremen
09/1994 - 06/2007	Research Scientist, Max-Planck-Institut für marine Mikrobiologie, Bremen.
1994	Ph.D., University of Delaware, Oceanography (Doctoral Advisor: Prof. Thomas M. Church, Ph.D.).
09/1992-08/1994	Post-doctoral Fellow, Max-Planck-Institut für marine Mikrobiologie, Bremen.
02/1990-01/1992	Graduate Research Assistant, College of Marine Studies, University of Delaware.
09/1989-01/1990	Graduate Teaching Assistant, Chemistry Dept., University of Delaware.
1988	M.S., University of Delaware, Marine Studies.
09/1984-08/1989	Graduate Research Assistant, College of Marine Studies, University of Delaware.
06/1983-08/1984	Research Associate, Miami University.
1983	B.phil, Miami University, Interdisciplinary Studies.