Mackenzie King

The Right Honourable William Lyon Mackenzie King, PC, LLB, PhD, MA, BA (December 17, 1874 July 22, 1950) was the tenth Prime Minister of Canada from December 29, 1921, to June 28, 1926; September 25, 1926, to August 7, 1930; and October 23, 1935, to November 15, 1948. With over 21 years in the office, he had the longest combined time in the Prime Minister position in British Commonwealth history.