المعهد الألماني للآثار
He received his PhD in 1973 at Heidelberg University with a thesis on ancient Greek numismatics supervised by Herbert A. Cahn. He worked from 1976 to 1981 at the German Archaeological Institute at Athens. In 1991, he was habilitated at the University of Saarbrucken and since 1994. He is a corresponding member of the German Archaeological Institute at Athens.