Wolfgang Effelsberg is Professor of Computer Science at the University of Mannheim. He studied Electrical Engineering at the Technical University of Darmstadt and holds a PhD in Computer Science. He has held research positions at the U.S. and at the European Networking Centre of IBM. His research focuses on high-speed networks and distributed multimedia systems.
Ralph Steimetz is the head of the multimedia department a the IBM European Networking Centre in Heidelberg. Since 1988 he has been involved in a number of projects in connection with multimedia systems.