"William Lyon Mackenzie King", Queen's Privy Council for Canada/PC, Order of Merit (Commonwealth)/OM, Order of St Michael and St George/CMG (December 17, 1874 – July 22, 1950), also commonly known as "Mackenzie King", was the dominant History of Canada/Canadian political leader from the 1920s through the 1940s. He served as the List of Prime Ministers of Canada/tenth Prime Minister of Canada from December 29, 1921 to June 28, 1926; from September 25, 1926 to August 7, 1930; and from October 23, 1935 to November 15, 1948. A Liberal with 22 years in office, he was the longest-serving Prime Minister in Canadian history. Trained in law and social work, he was keenly interested in the human condition (as a boy, his motto was "Help those that cannot help themselves"), and played a major role in laying the foundations of the Canadian welfare state.If you enjoy these quotes, be sure to check out other famous politicians! More William Lyon Mackenzie King on Wikipedia.