Committees (period 1986-2010)
Time Allocation Committee IUE Satellite (1986-1994; Chmn. 1994)
J-IUE Time Allocation Committee, NASA+ESA+PPARC, Chmn. (1995-1996)
Member Science Technology Committee ESO (1991-1995)
Gutachterauschuss Verbundforschung Astrophysik des BMBF + DLR (1995-2001, Vors.)
Portugese Program for Astronomy Research - Madeira (1994)
Spokesman of Graduiertenkolleg Bonn/Bochum on the "Magellanic Clouds and other Dwarf Galaxies" (1999-2001)
Science Advisary Board of the MPI for Astronomy, Heidelberg (1987-1995)
Mitglied Projektgruppe des DIVA Satellitens (1995-2001)
Member of Science Advisary Group for the ESA GAIA satellite project (1998-2000)
Board of Directors of A&A (2001-2011, Member, Vice-Chmn., Chmn.)
Fachbeirat der Landessternwarte Tautenburg (2003-2006)
Kuratorium Web-Projekt Welt der Physik (bis 2006-2010)
Leiter Webprojekt "Physik des Monats"
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