Last weekend I returned with Pauline from Umbria to the Netherlands. We stayed one night in Lausanne, where we visited Jacques Waardenburg and Hillary Killpatrick in their nice apartment with a splendid view on Lake Leman with its background of the white mountains of the Alps.
I know Jacques since 1978-9 when I was the organizer of the course for nine IAIN staff who came to Leiden to experience the Western tradition of religious studies. Among them where Muhammad Chatib Quzwain (later a dissertation on al Palimbani; Secreteray General of the ministry of religion), Chalidjah Hasanuddin (later a disseration on Jamiatul Washliyah, a movement in Medan), the late Husnul Aqib Suminto (, died already; a nice dissertation on Dutch religious policy in their colony) and Alfani Daud (also already deceased; dissertation on popular or 'tribal' Islam in South Kalimantan). Jacques Waardenburg gave lectures to them and personal advise to Burhanuddin Daya on comparative religion.
One academic colleague wrote about him in a German Festschrift as Der fliegende Holländer, because Koos was an arduous and eager visitor of conferences, a true Flying Dutchman.
He also had an immense library and was keen in collecting material for his archive. This will be kept in the National Archive in the Netherland (Haarlem section where the academic archives are kept.