Born 1949 in Düsseldorf. Studies of economics and history, Universities of Marburg and Heidelberg, Diploma in Economics, University of Heidelberg (1970), PhD in economics Mass. Inst. of Technology (1973), Research Associate Stanford Univ. (1973–1974), Asst. Prof. Princeton Univ. (1974–1977), Academic Staff and Prof. Univ. Bonn (1977–1979), Full Prof. Univ. Bonn (1979–1987), Basel (1987–1996), Taussig Research Prof. Harvard Univ. (1995–1996), Full Prof. Mannheim Univ. (1996–2004), Jelle Zijlstra Professorial Fellow, Netherlands Institute for Advanced Study, Amsterdam, (2008), Scientific Member and Director of the Max Planck Institute for Research on Collective Goods in Bonn and Professor of Economics, University of Bonn (since 2004), Emeritus (since 2017).