| since 2003 | Research on reforming German federalism, European integration, democratic theory and other topics at the MPI for the Study of Societies in Cologne |
| 2003 | Retirement |
| 1986-2003 | Director at the Max Planck Institute for the Study of Societies, Cologne |
| 1973-1984 | Director of the International Institute of Management at Wissenschaftszentrum für Sozialforschung (WZB), Berlin |
| 1968-1974 | Full Professor of Political Science at the University of Konstanz |
| 1964-1966 | Assistant Professor, Yale Law School |
| 1964 | Dr. jur. and bar exam, University of Freiburg |
| 1961 | LL.M. (Master of Laws), Yale Law School |
| 1959 | First law degree, University of Freiburg |