since 2002 Professor of Theoretical Physics (C4), Technische Universität Darmstadt
1997-2002 Privatdozent, Theoretical Physics, Universität Ulm
1991 Member of the Institute for Theoretical Physics, University of California at Santa Barbara (USA)
1988-1997 Assistant Professor and Privatdozent, Universität Freiburg i.Br.
1986-1988 Postdoctoral Fellow, Universiät Innsbruck
(1986 Military Service)
1983-1985 Research Associate, Joint Institute for Laboratory Astrophysics, Boulder (USA)
1981-1983 Research Assistant, Universität Innsbruck