At some point, ICS's affiliation with VU required that a full-time Senior Member in History of Philosophy be added to the faculty, so that candidates for the PhD program in philosophy sponsored by VU, could meet VU's own internal requirements regarding the credit hours in discipline of history of philosophy, a trademark of VU's philosophy faculty since its establishment under Vollenhoven. ICS was quite amenable to this arrangement. Runner, Hart, and Seerveld had all studied history of philosophy directly under Vollenhoven. A recently graduated fourth Senior Member "promoted" by Vollenhoven, Al Wolters received the first ICS appointment as Senior Member in history of philosophy.