Doctor of Philosophy in Mathematics, Technology University Berlin, 1971. Habilitation in Computer Science, Technology University Berlin, 1974.
Assistant department mathematics Technology University Berlin, 1970-1972, assistant professor computer science, 1972-1976, associate professor, 1976-1985, professor, since 1985. Director, vice-director Technology University Berlin Institute Software and Theoretical Computer Science, 1985—1995. Director Institute Communications and Software Engineering, 1995-2000, Institute Software Engineering and Theoretical Computer Science, since 2001.
Visiting professor International Business Machines Corporation, Yorktown Heights, University Southern California, Technology University Catalunya, Spain, University Pisa, Italy. Kloosterman professor University Leiden, 1993. Chairman steering committee International Conference Graph Transformation.
Member steering committee European Joint Conference Theory and Practice Software. Coordinator priority program software Deutsche Forchungsgemeinschaft, 1998—2004.
Fellow: Society Design and Process Science. Member: Deutsche Forschungsgemeinschaft (coordinator priority program 1998—2004, grantee since 1981), German Computer Society, European Association Software Science and Technology (vice president), European Association for Theoretical Computer Science, European Mathematics Society, German Mathematics Society.
Married Gertraud Summerer. Children: Karsten, Timo, Rita.