Director
of the Potsdam Institute for Climate Impact Research and visiting professor
at Oxford University (physics department and Christ Church College);
Heisenberg Scholarship (1989); Extensive research activities abroad,
e.g., University of California, Santa Barbara and Santa Cruz; Professor
(1989) and later Director at the Center for Marine Environmental Research
(ICBM) at the University of Oldenburg; Since 1993 Professor for Theoretical
Physics at the University of Potsdam; Chair of the Global Change Advisory
Group for the 6th EU Research Framework Programme of the EU; Leadership
and review activities for numerous international programmes. 2001-05
research director of the Tyndall Centre for Climate Change Research
in Norwich (UK). Since 2005 member of the National Academy of Sciences.
WBGU Member since 1992, 1994-1996 Vice Chair, 1996-2000 Chair, 2004–2008
Vice Chair again, since 2009 Chair.