Main functions
- Former Professor of Reformatorical Philosophy at the Universities in Delft, Eindhoven and Wageningen
- 1983 - 2011: Member of the Senate (Eerste Kamer) of the Dutch Parliament (the States General) for, first, the Reformatorische Politieke Federatie, and since 2000, the Christen Unie
Other functions
- 1976 - 1983: President of the Centre for Reformatorical Philosophy.
- 1987 - 1997: President of the Prof. dr. G.A. Lindeboom Institute -- Centre for Medical Ethics.
- 1996 - 2002: President of the Institute for Cultural Ethics.
- 1997 - 2005: Member of the Board of Supervisors of "het Nederlands Dagblad".
- 2002 - 2012: President of the Board of Supervisors of the Institute for Cultural Ethics.
- 2003 - 2013: President of the scholarship fund "Pro Rege".
