Born in 1954 in Ludwigshafen am Rhein. Study of physics, Heidelberg Univ., doctorate (1983), habilitation (1987). Feodor-Lynen-Fellow at Lawrence Berkeley Laboratory, Berkeley, CA (1987-1988), Heisenberg Fellow at CERN, Geneva (1989-1993), Professor for Experimental Physics and Chair of III. Physikalisches Institut, RWTH Aachen (1993-1999), Director and Scientific Member at the Max-Planck-Institut für Physik (since September 1999). Emeritus.