Born 1951 in Hillesheim. Studies of mathematics with Diplom 1976 and Promotion 1979 at the University of Bonn. Habilitation, University of Bonn 1984. Scientific Assistant, University of Bonn 1979-1985. Research Scholarship (DFG), University of Pennsylvania 1980-1981. Associate Professor, University of Maryland 1984-1986. Associate Professor, University of Bonn 1986-1987. Full Professor, University of Zürich 1987-1989. Full Professor, University of Bonn since 1989. Director at the MPI for Mathematics 2007-2019. Scientific Member of the Max Planck Society since 2007. Emeritus since 2019.