William Lyon Mackenzie King (December 17, 1874 – July 22, 1950), also commonly known as Mackenzie King, was the dominant Canadian political leader from the 1920s through the 1940s. He served as the tenth Prime Minister of Canada in 1921-1926, 1926-1930, and 1935-1948. He is best known for his leadership of Canada throughout the Second World War (1939-1945) when he mobilized Canadian money, supplies and volunteers to support Britain while boosting the economy and maintaining home front morale. 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.