With International Business Machines Corporation, Wiesbaden, Federal Republic of Germany, 1965-1966. Research assistant German National Science Foundation University Karlsruhe, Federal Republic of Germany, 1966-1971. Professor University Goettingen, Federal Republic of Germany, 1977-1978, University Aachen, Federal Republic of Germany, 1978-1982.
Professor Institute Informatik I Universität Würzburg, Federal Republic of Germany, since 1982. Managing director Computer Center, Goettingen, 1977-1978.
Member Gesellschaft Informatik, European Association Theoretical Computer Science, Association for Computing Machinery (ACM), International Association of Applied Mathematics and Mechanics, GROOR.
Married Erika Noltemeier, 1968. Children: Sven, Anja, Knut.