 A self-declared member of the Darmstadt School , he studied composition in Cologne with Karlheinz Stockhausen and Gottfried Michael Koenig, and philosophy, sociology, and musicology at the University of Cologne, where he received a PhD in 1966 .After receiving his doctorate, he settled in Amsterdam, working until 1968 at the Institute for Sonology, Utrecht University.In 1972, he was appointed professor of music history and theory at the Royal Conservatory of The Hague .