National
Member of the Board of Fysikcentrum, 1989 - date
Member of NFR ESO-NOT Committee, 1990 - date
Member of the Swedish National Committee, 1990 - 1995
Deputy member of the Faculty Board at Stockholm University, 1990 - 1995
Member of Sektionsberedningen at Stockholm University, 1990 - date
Member of the Working Group for Faculty Positions [Professorsberedningsgruppen] at Stockholm University, 1992 - 1996
Member of Tjänsteförslagsnämnden at Stockholm University, 1992 - date
Member of the Royal Swedish Academy of Sciences (KVA), 1993 - date
International
Member of Nordita Astrophysics Committee, 1991 - date (chairman 1996 - date)
Member of ESA Working Group for Horizon 2000+, 1993
Member of the Scientific Organizing Committees for (1) IAU Colloquium 145 "Supernovae and Supernova Remnants", Xian, China, 1993; (2) Herstmonceaux Conference 34 "Circumstellar Media in the Late Stages of Stellar Evolution", Cambridge, UK, 1993
Member of ESO Visiting Committee, 1993 - 1996
Member of Time Allocation Committee for Hubble Space Telescope, 1996
Chairman of ESO Committee for VLT Key Programs, 1996 - date