since April 2011 Director, Center for Earth System Research and Sustainability, KlimaCampus Hamburg, Universität Hamburg
since 2008 Fellow of Max-Planck-Society
since July 2003 Professor (C4), Institute of Oceanography, Universität Hamburg
2010 - 2011 Director, Center for Marine and Climate Research, KlimaCampus Hamburg, Universität Hamburg
2005 - 2011 Adjunct professor, Scripps Institution of Oceanography
2005 - 2011 Managing director, Institute of Oceanography, Universität Hamburg
2003 - 2005 Professor, Scripps Institution of Oceanography
April 2003 CIMAS Visiting Scientist, 'Rosenstiel School of Marine and Atmospheric Science'
July 2002 Visiting Scientist at MIT
July 2001 Visiting Scientist at Institute of Oceanography, Kiel
July 2000 Visiting Scientist at Oregon State University
1999 - 2003 Associate Professor, Scripps Institution of Oceanography
July 1998 Visiting Scientist at Woods Hole Oceanographic Institution
1997 - 2001 Principal research scientist, MIT
1995 - 1997 Research scientist, MIT
1993 - 1995 Research scientist, MIT (advisor: Prof. C. Wunsch)
1992 - 1993 Research scientist, Institute of Oceanography, Kiel
June 1992 PhD in Oceanography at the University of Kiel, Title: "On the mesoscale variability in the Atlantic Ocean" (advisor: Prof. J. Willebrand)
February 1987 Diploma in Oceanography at the University of Kiel, Title: "Seasonal Variation of the isopycnic potential vorticity in the warm water sphere of the North Atlantic" (advisor: Prof. J. D. Woods)
1983 - 1984 Graduate study at University of Hawaii, Honolulu, USA
1979 - 1992 Studies of physical Oceanography, Meteorology, Geophysics and Physics in Kiel (F.R.G.)
