Heidelberg Center for the Environment (HCE), tegevdirektor 01.01.2012–...
Heidelberg University, Institute of Environmental Physics, professor 01.01.2003-...
Heidelberg University, Fellow at the Marsilius Kolleg 01.01.2009–31.12.2010
Heidelberg University, Department of Physics and Astronomy, dekaan 01.01.2008–31.12.2010
ETH Zurich, Switzerland, assistant lecturer 01.01.2000–31.12.2002
ETH Zurich and Eawag (Swiss Federal Institute of Aquatic Science and Technology, Dübendorf), teadur 01.01.1996–31.12.2002
Lamont-Doherty Earth Observatory of Columbia University (Palisades, New York, USA), Geochemistry Division, postdoctoral fellow 01.01.1994–31.12.1996
ETH Zurich and Eawag, teadur 01.01.1990–31.12.1994