Professor, Department of Historical Studies, University of Toronto Mississauga, 1976-; tenure award, 1980; appointment to graduate faculty, 1984; promotion to Full Professor, 1991.
- Professor Emeritus, 1 July 2009.
Modern European History, University of Glasgow, 1968-69.
Modern European history, Concordia University, Montreal, July-August 1975.
Freelance writer and historian:
Principal research assistant to Sir Martin Gilbert, official Winston Churchill biographer, 1969-70.
Research assistant to the late V.V. Tilea, Romanian Minister in London (1938-40), 1970-73.
Commissioned by André Deutsch Ltd. to write a book on the origins of the Second World War. Published on 3 September 1973.
Invited by the late A.P. Young, OBE, to edit a volume of memoirs dealing with his involvement in the German resistance to Hitler. Published on 22 August 1974.
Commissioned by Weidenfeld and Nicolson Ltd. to write a biography of Sir Anthony Eden (Lord Avon). Published on 14 July 1976.
For The Sunday Telegraph (London, England), 1976.
For The Ottawa Citizen, 1977-79.
Honours and Nominations
The Knighthood of Mark Twain, 1977 (re: Anthony Eden; also held by Lord Avon).
Elected: Fellow of the Royal Historical Society, United Kingdom, May 2005.
North American Conference on British Studies, 1995-.
Royal Historical Society of the United Kingdom, 2005-.