Doctorate, University Bonn, Germany, 1959. Doctorate (honorary), Ecole Pratique Hautes Etudes, Paris, 1996. Doctorate (honorary), Georgetown University, 1997.
Assistant University Frankfurt, 1958-1963, docent, 1964-1967. Associate professor American University, Beirut, 1967-1968. Professor University Tuebingen, Germany, 1968-1999, professor emeritus Germany, since 1999.
Visiting associate professor University of California at Los Angeles, 1967.
Fellow Medieval Academy of America, Heidelberger Akademie, Académie Inscriptions Belles Lettres, Academia Europea.
Married Marie-Luise Bremer, August 10, 1959. Children: Margarete, Hans, Gertrud, Richard.