1928-1931 studied at the Advanced Military Academy in The Hague
1933-1940 Adjutant to the commander of the field army
Dissertation ‘Development of humanistic theories of political justice’
1942-1945 Imprisoned by Nazis in Stanislau POW camp. Recommended A New Critique of Theoretical Thought by Herman Dooyeweerd to Hans Rookmaaker while in prison.
1945-1975 worked for Dutch equivalent of the FBI and then taught Christian philosophy at the school of economics in Rotterdam. Later at University of Leiden.