Great Offices of State have come close to achieving this distinction: Herbert Henry Asquith and Winston Churchill both served as Chancellor, Prime Minister and Home Secretary while Harold Macmillan and John Major served as Prime Minister, Chancellor and Foreign Secretary. Rab Butler and Sir John Simon served as Chancellor of the Exchequer, Foreign Secretary and Home Secretary. Two of the Great Offices of State have often been held simultaneously by one person, most recently by Ramsay MacDonald, Prime Minister and Foreign Secretary in 1924; Arthur Wellesley, the Duke of Wellington, is the only person to have held three of the Great Offices simultaneously, serving
Prime Minister of Canada and McGill Universities, as well as working in the financial sector; Lester B. Pearson, who acted as Chancellor of Carleton University; Joe Clark and Kim Campbell, who became university professors, Clark also consultant and Campbell working in international diplomacy and as the director of private companies and chairperson of interest groups; while Pierre Trudeau and Jean Chrétien returned to legal practice. Former prime ministers also commonly penned autobiographies—Tupper, for example—or published their memoirs—such as Diefenbaker and Paul Martin. Prime Minister of Canada The Prime Minister of Canada () is the primary minister of the Crown, chairman of the Cabinet, and