Professor of Information Law at the University of Amsterdam. He was director of the Institute for Information Law (IViR) at this University from 1989 2004. He was member of the bar of the Supreme Court in The Hague (1968 1995) and is a member of the Bar in Amsterdam since 1995. He specializes in media and telecommunications law and published several handbooks on the subject. He is a member of the Dutch National Advisory Commission on copyright.