Heidelberg Center for the Environment (HCE), tegevdirektor 01.01.2012–...
Heidelbergi Ülikool, Institute of Environmental Physics, professor 01.01.2003-
Heidelbergi Ülikool, Fellow at the Marsilius Kolleg 01.01.2009–31.12.2010
Heidelbergi Ülikool, Department of Physics and Astronomy, dekaan 01.01.2008–31.12.2010
ETH Zürich, assistant lecturer 01.01.2000–31.12.2002
ETH Zürich und 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 Zürich und Eawag, teadur 01.01.1990–31.12.1994