Sir William McMahon was an Australian politician who served as the 20th Prime Minister of Australia from 1971 to 1972. Born on February 23, 1908, McMahon entered politics in 1949 and held various ministerial positions before becoming Prime Minister. He was known for his dedication to economic and social policies, as well as his commitment to the principles of liberalism. McMahon's tenure as Prime Minister was marked by efforts to stabilize the economy and navigate challenging foreign policy issues. He retired from politics in 1982 and passed away on March 31, 1988.