BS 1960.
Ph.d. 1964.
Kandidatstipendiat 1964-67.
Universitetsadjunkt 1968-71.
Lektor 1971-89.
Docent 1989-96.
Forskningsprofessor 1996-2001.
Professor fra 2001.
Gæsteprofessor, University of British Columbia, Canada, 1975.
Gæsteprofessor, University of South Carolina, USA, 1978 and 1981.
Gæsteprofessor, University of Florida, USA, 1975, 1978, 1981, and 1985.