Robert Menzies Robert Menzies Sir Robert Gordon Menzies, (; 20 December 189415 May 1978), was an Australian politician who twice served as Prime Minister of Australia, in office from 1939 to 1941 and again from 1949 to 1966. He played a central role in the creation of the Liberal Party of Australia, defining its policies and its broad outreach. He is Australia's longest-serving prime minister, serving over 18 years in total. Menzies studied law at the University of Melbourne and became one of Melbourne's leading lawyers. He was Deputy Premier of Victoria from 1932 to 1934, and then transferred to federal parliament,
Deputy Prime Minister of Australia leader of the Country Party (subsequently the National Party). That continues to be case when the Coalition is in government. In the case of Labor governments, the party's deputy leader was and continues to be the Deputy Prime Minister. On 19 December 1967, John McEwen, the long-serving leader of the Country Party in the Coalition government, was sworn in as interim Prime Minister following the sudden death in office of Prime Minister Harold Holt. (There was discussion that deputy Liberal leader and Treasurer William McMahon should assume the office. McMahon had planned a party room meeting on 20 December to