Denis Vincent Napthine (born 6 March 1952) is a Australian politician for the Liberal Party in the state of Victoria. He is a member of the Victorian Legislative Assembly, representing the electoral district of South-West Coast. Following the resignation of Ted Baillieu, he was elected leader of the Parliamentary Liberal Party on 6 March 2013 and was sworn in as the 47th Premier of Victoria later the same day. On 29 November 2014, at the Victorian state election, the Coalition was defeated by Labor and Napthine conceded defeat and his term as Premier ended on 4 December 2014 when the new Labor government was sworn in and he resigned as Liberal leader and was succeeded in the Liberal leadership by Matthew Guy.