 He moved to Cologne, Germany in 1967 to become assistant to Karlheinz Stockhausen, and became a member of his performing ensemble .In 1969, together with Johannes Fritsch and David C. Johnson, he founded the Feedback Studio, Cologne, a new-music performance center and publishing house.He later moved to England, where he became in 1979 a founding member of the Electro-Acoustic Music Association of Great Britain.