George Norman Hillmer CM (born 1942) is a Canadian historian and is among the leading scholars on Canada–US relations. Hillmer completed his Bachelor of Arts and Master of Arts degrees in history at the University of Toronto in 1966 and 1967, respectively, before going on to earn a Doctor of Philosophy degree from Christ's College, Cambridge, in 1974. During this period, he also worked as an assistant to former Prime Minister Lester Pearson, who was then working at Carleton University's Norman Paterson School of International Affairs. In 1972, Hillmer joined the Directorate of History at Canada's Department of National Defence as a staff historian. He rose to become the acting director of the directorate before shifting in 1990 to a full-time career as a professor of history and internatio