After the second world war the Association for Calvinistic Philosophy took advantage of a legal provision which, by establishing a second organization for that purpose, allowed those interested in the further project to appoint professors in special chairs at state universities. Johan Mekkes was appointed in 1947 at Rotterdam, Leiden and Eindhoven, K. J. Popma at Groningen in 1948 and later Utrecht (1955), S. U. Zuidema at the Free University and Utrecht in 1948 and Hendrik Van Riessen at Delft and Eindhoven in 1951.