Wilfred Gordon ‘Bill’ Bigelow, who helped develop the first electronic pacemaker, was a professor of cardiac surgery at the University of Toronto and a pioneering heart surgeon. He was born in Brandon, Manitoba, in 1913. His father, Wilfred Bigelow, had founded the first medical clinic in Canada. Bill trained in medicine at the University of Toronto and did his internship at the Toronto General Hospital, during which time he had to amputate a young man’s fingers because of frostbite, leading Bill to research the condition. During the second world war, he served with the Royal Canadian Army Medical Corps, in a field transfusion unit and then as a battle surgeon with the 6th Canadian Casualty Clearing Station in England and Europe, where he saw many more soldiers with frostbitten limbs. After the war, he returned to a surgical residency in Toronto, followed by a graduate fellowship at Johns Hopkins Hospital in Baltimore. He returned to Toronto in 1947 as a staff general surgeon. In 1950 he became a research fellow in the university department of surgery. He was made an assistant professor in 1953 and a full professor in 1970. He researched into hypothermia in a cold-storage room in the basement of the Banting Institute. He theorised that cooling patients before an operation would reduce the amount of oxygen the body required and slow the circulation, allowing longer and safer access to the heart. This work led to the development of a cooling technique for use during heart operations. He also discovered that he could restart the heart by stimulating it with a probe at regular intervals, work which led him on to develop the first electronic pacemaker, in collaboration with John Callaghan and the electrical engineer John Hopps. He published extensively and received many awards, including the Order of Canada and the honorary Fellowship of our College. He was President of the American Association for Thoracic Surgery and the Society for Vascular Surgery. He was predeceased by his wife, Margaret Ruth Jennings, and is survived by his daughter, three sons and three grandchildren. He died from congestive heart failure on 27 March 2005.