1996-1999
| Doctoral Fellow, Center for Tropical Marine Ecology (ZMT), University of Bremen (Germany)
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2000-2001
| Postdoc, Alfred Wegener Institute for Polar and Marine Research, Bremerhaven (Germany)
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2001-2003
| Postdoc, School of Oceanography, University of Washington (Seattle, USA)
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2003-2008
| Assistant Professor, Florida State University, Department of Oceanography, Tallahassee (USA)
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2008-2013
| Head of the Max Planck Research Group for Marine Geochemistry, University of Oldenburg and Max Planck Institute for Marine Microbiology, Bremen (Germany)
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| Since 2013 | Professor for Marine Geochemistry, Head of the ICBM-MPI Bridging Group for Marine Geochemistry, Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg (Germany) |
