Son of Olga Boissevain and Bram van Stockum. Brother of Hilda van Stockum. Large Gold medalist, Mathematics, Trinity, Dublin. Ph.D., University of Ediburgh. Appointed to post at Institute for Advanced Study, Princeton, spring 1939. Taught at Toronto and Univ of Maryland until WWII broke out. Time Travel Pioneer. Pilot of RAF Halifax Bomber, shot down over Laval, France, while on a post-D-Day mission, June 10, 1944.