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  • Architect in the Public works department, Amsterdam, 1946–1951
  • Private practice in Amsterdam since 1951
  • in partnership with Theo Bosch 1971–1983
  • Tutor in Art History, Enschede, Art and Industrial School,
  • AKI, Netherlands 1951–1954
  • Tutor, KNO, Art School, Amsterdam, 1950–1966
  • Tutor, Academie voor Bouwkunst, 1956–1961
  • Visiting Tutor, University of Pennsylvania, Philadelphia, Washington University, St. Louis, Harvard University, Cambridge, Massachusetts, Tulane University, New Orleans, and the School of Architecture, Singapore, 1961–1968
  • Guest Professor, ETH, Ziirich, 1977–1978
  • Professor, Technische Hogeschool Delft, since 1966
  • Paul Philippe Cret Professor of Arehitecture,
  • University of Pennsylvania, since 1979
  • Member of ’De 8 en Opbouw’, since 1946
  • Dutch delegate to CIAM 1947 until dissolution
  • COBRA-participant (artist group 1948–1950)