German Mathematical Society
From 1990 to 1998 he was an editor of Mathematische Annalen and from 1998 to 2002 for Archiv der Mathematik. Since 2000 he has been a member of the . In 2003 he was made an honorary doctor of the University of Siegen. In 2010 he was awarded the Cantor Medal. In 2012 the German Mathematical Society awarded him a Gauss Lectureship.