John Wayne Olsen, AO (born 7 June 1945) was Premier of South Australia between 28 November 1996 and 22 October 2001. He was twice the parliamentary leader of the South Australian Division of the Liberal Party of Australia in the South Australian House of Assembly, from 1982 to 1990 and again from 1996 to 2001. He unsuccessfully led the party to both the 1985 election and 1989 election. In 1990 Olsen was appointed to a casual vacancy in the Australian Senate, but quit less than two years later to return to the South Australian House of Assembly at the 1992 Kavel by-election. He ran for the Liberal leadership but lost to Dean Brown, who successfully led the party to a landslide at the 1993 election, however Olsen successfully challenged Brown for the Premiership and Liberal leadership a year before the 1997 election where the Olsen Liberals were reduced to minority government. Due to the Motorola affair where Olsen misled parliament, he resigned the premiership to Rob Kerin several months before the 2002 election where the Liberals lost government. Olsen is the longest-serving Liberal Party of Australia Premier of South Australia and the fourth-longest-serving Leader of the Opposition.