For four decades Lester Bowles Pearson (April 23, 1897-1972) has been noted for his diplomatic sensitivity, his political acumen, and his personal popularity. He is affectionately called «Mike», a nickname given to him by his flying instructor in World War I, who discarded «Lester» as being insufficiently bellicose.
Born in Toronto of Irish stock on both sides of his family, he received a balanced education in politics, learning the conservative position from his father, a Methodist minister, and the liberal from his mother. Pearson entered Victoria College at the University of Toronto in 1913 at the age of sixteen. Too young to enlist as a private when Canada declared war in 1914, he volunteered to serve with a hospital unit sponsored by the University. After two years in England, Egypt, and Greece, he was commissioned and transferred eventually to the Royal Flying Corps, but, sustaining some injuries from two accidents, one of them a plane crash, he was invalided home. He served as a training instructor for the rest of the war, meanwhile continuing his studies at the University. He received his degree in 1919 and then worked for two years for Armour and Company, a meat processing firm; years later he said, with the wit for which he is renowned, that the Russians were claiming he had once worked for an armament manufacturer. Returning to academic life, Pearson won a two-year fellowship and enrolled at Oxford University. There he excelled not only in his chosen field of history where he received the bachelor and master degrees, but also in athletics where he won his blues in lacrosse and ice hockey and even played on the British ice hockey team in the 1922 Olympics.
In 1924 Pearson joined the staff of the History Department of the University of Toronto, leaving it and academic life in 1928 to accept a position as first secretary in the Canadian Department of External Affairs. In this post until 1935, Pearson received an education in domestic economic affairs while «on loan»; in 1931 as secretary to a commission on wheat futures and during 1934-1935 as secretary of a commission investigating commodity prices; the same post provided him with an apprenticeship in international diplomacy when he participated in the Hague Conference on Codification of International Law(1930), the London Naval Conference (1930), the Geneva World Disarmament Conference (1933-1934), another London Naval Conference (1935), and in sessions of the League of Nations (1935).
Pearson moved forward rapidly. From 1935 to 1941 he served in the office of the High Commissioner for Canada in London; in May, 1941, he was appointed assistant undersecretary of state for External Affairs at Ottawa; in June, 1942, named minister-counselor at the Canadian Legation in Washington; in July, 1944, promoted to the rank of minister plenipotentiary and in January, 1945, to the rank of ambassador. During his Washington stay, Pearson participated in the establishment of the United Nations Relief and Rehabilitation Administration (UNRRA) in 1943 and the United Nations Food and Agriculture Organization (FAO) 1943-1945; in the Dumbarton Oaks Conference on preliminary discussion for an organization of united nations (1944); and in the San Francisco Conference on the establishment of the UN (1945).
Pearson took over the post of undersecretary of state for External Affairs in the fall of 1946, but gave it up two years later for the possibility of action in a larger arena. In that year, Louis S. St. Laurent, the secretary of state, became prime minister of a Liberal government, replacing his retiring leader, Mackenzie King. Pearson, having conducted a successful campaign for a seat in the Commons to represent the Algoma East riding of Ontario, was given the External Affairs portfolio, holding it for nine years until the advent of John Diefenbaker's Conservative government.
Pearson drafted the speech in which Prime Minister St. Laurent proposed the establishment of the North Atlantic Treaty Organization (NATO), signed the enabling treaty in 1949, headed the Canadian delegation to NATO until 1957, and functioned as chairman of the NATO Council in 1951-1952. Pearson also headed the Canadian delegation to the UN from 1946 to 1956, being elected to the presidency of the Seventh Session of the General Assembly in 1952-1953. As chairman of the General Assembly's Special Committee on Palestine, he laid the groundwork for the creation of the state of Israel in 1947. In the Suez crisis of 1956, when the United Kingdom, France, and Israel invaded Egyptian territory, Pearson proposed and sponsored the resolution which created a United Nations Emergency Force to police that area, thus permitting the invading nations to withdraw with a minimum loss of face.
When the Liberals were defeated in the elections of 1957, Pearson relinquished his cabinet post but, accepting that of leader of the Opposition, began to rebuild the party. Six years later, when the Conservative government lost the confidence of the electorate, especially on the issues raised by the Cuban confrontations between the United States and Russia, and when Pearson, after a careful review of his philosophical position on national defence, announced his willingness to accept nuclear warheads from the United States, the Liberal Party was voted enough strength to establish a government with Pearson as prime minister.
In control for five years, Pearson pursued a bipartisan foreign policy based on a philosophy of internationalism. In domestic policy he implemented programs long discussed but never adopted; among them, in the field of social legislation: provisions for old age pensions, medical care, and a generalized «war on poverty»; in education: governmental assistance for higher education and technical and vocational education; in governmental operations: redistribution of electoral districts and reformation of legislative procedures. The most acrimonious debate of his half-decade in office centered on legislation to create a new flag for Canada. This legislation became the battlefield of the Conservatives, who wanted some portion of the design to recognize the traditions of the past, versus the Liberals, who wanted to eliminate historical symbols. The Liberals won and the new flag was raised on February 15, 1965.

Pearson retired from the leadership of his party in the spring of 1968 and died in 1972.