 Between 1982 and 1985 he served as Dean of the School of European Studies.He also taught Modern European History at the University of Hamburg and at the University of Freiburg.He was elected to a Fellowship of the Alexander von Humboldt Foundation in 1970, at the "" in Munich in 1986–87, the Woodrow Wilson International Center for Scholars at Washington in 1989–90, the Institute for Advanced Study at Princeton in 1994, and the National Humanities Center in North Carolina in 1997–98.