MIT-Harvard Joint Center for Urban Studies 1962-1964; Mellon Fellow 1964-1965; Stouffer Fellow 1966-1967; Assistant Professor of Architecture and Planning 1968-1970; Associate Professor 1970-1971; Professor of Architecture and Urban Planning 1971-; Dean of the School of Architecture and Planning 1971-1980; Director, Laboratory of Architecture and Planning 1973-1980.