Sitting at the Residence of former Prime minister of Canada William Lyon Mackenzie King OM, CMG, PC(December 17, 1874 – July 22, 1950), also commonly known as Mackenzie King, was the dominant Canadian political leader, as thePrime Minister of Canada, 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 21 years and 154 days 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.