He was a professor at the Technical University of Berlin from 1963 to 1967 and served as the dean of the faculty of architecture from 1965 to 1967. In 1968 he moved to the United States, where he became the chair of the department of architecture at Cornell University from 1969 to 1975. In 1971 he became a member of the American Institute of Architects. He was also a visiting professor at Harvard University (1973 and 1978) and the University of California, Los Angeles (1974/75). He returned to Germany in 1976, becoming a visiting professor at the University of Applied Arts Vienna (1979/80) and a full professor at the Kunstakademie Düsseldorf (1986).
