* 1898 in Rotterdam
† 1978 in The Hague
- studied at the Technical University of Delft; Diploma 1924
- 1927–1937 had own office in Rotterdam
- 1937–1948 joint office with J. A. Brinkman
- from 1947 professorship at TU Delft; member of several institutions like Congrès Internationaux d’Architecture Moderne (CIAM)
- 1948 office with J. B. Bakema; various building activities in all sectors: significantly involved in the reconstruction of Rotterdam