since 2004 |
Senior Research Fellow, Max Planck Institute for Public Goods Research in Bonn |
| since 1977 | Member, Scientific Advisory Committee of the Federal Ministry for Economic Affairs and Technology |
| 1986 – 2003 | Director, Energy Ecconomy Institute at the Unviersity of Cologne |
| 1986 – 2003 | Professor of Economics, University of Cologne |
| 1986 – 1998 | Member, German Monopoly Commission (1989-1998 Director) |
| 1982 – 1988 | Member, Kronberger Scientific Council |
| 1982 – 1986 | Professor of Economics, Bern University |
| 1974 – 1981 | Professor of Economics, Bonn University |
| 1972 – 1974 | Professor of Mathematical Economics Research, Bielefeld University |
| 1968 – 1970 | Professor of Economics, Massachusetts Institute of Technology |
| 1965 – 1972 | Professor of Economics, Heidelberg University |