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Committee Memberships
| 2008 - | Chairman of the Senate Commission on Collaborative Research in Geoscience |
| 2007 - | Chairman of the German Marine Research Consortium (KDM) |
| 2007 - | Member of the curatorship of the GFZ Potsdam |
| 2006 - | Member Science Advisory Structure Executive Committee (SASEC) of IODP |
| 2006 - | Member Senate Leibniz Gemeinschaft |
| 2006 - | Chairman Steering Committee, Wissenschaft im Dialog |
| 2005 - | Chairman of the Geologische Vereinigung |
| 2005 | Coordinator "Stadt der Wissenschaft 2005" (City of Science 2005) |
| 2001 - | Director of the DFG Research Center "The Ocean in the Earth System" - MARUM (former RCOM) |
| 2001 - | President of the "Wittheit zu Bremen" (Scientific Society of Bremen) |
| 2000 - | Vice-president of the GeUnion Alfred-Wegener-Foundation |
| 1995 - 2006 | European Science Foundation (ESF), Marine Board member (1999 - 2002 Vice Chair) |
| 1994 - 2000 | Member of the Scientific Advisory Board of the Netherlands Institute for Sea Research (NIOZ), Texel |
| 1991 - 1994 | Ocean History Panel (OHP) of the Ocean Drilling Program (ODP) |
| 1990 - 1991 | Foundation committee of the Institute for Baltic Sea Research in Rostock-Warnemünde (IOW) |
| 1989 - 2001 | Speaker of the SFB 261, Bremen University |
| 1989 - 2004 | Oceanography Commission of the German Research Foundation (Chairman 1995 - 2004) |