Doctor of Philosophy, Freiburg (Germany) University, 1958. Habilitation, Freiburg (Germany) University, 1969.
Assistant professor modern history University Freiburg, 1958-1971. Full professor modern history Frankfurt (Germany) University, 1972-1980, Aachen (Germany) University of Technology, 1980-1997. Retired, since 1997
Adenauer professor Georgetown University, Washington, 1990-1991, Monnet professor European Commission Brussels, 1992.
Member American History Association, Society Historians of America Foreign Relations, Historians on the History of European Integration (vice chairman liaison group since 1987).
Married Rosemarie Gerda Fritzsche, September 16, 1961. Children: Gerhard, Ruth, Wolfgang, Ulrich.