David Wickham Ridgway is a South Australian politician who served as a member of the South Australian Legislative Council from 2002 to 2021, representing the Liberal Party of Australia (SA). Ridgway served as the Minister for Trade and Investment in the Marshall Ministry from 22 March 2018 to 26 July 2020, and as Minister for Tourism from March 2018 to January 2020.

Martin Leslie James Hamilton-Smith is a former Australian politician who represented the South Australian House of Assembly seat of Waite from the 1997 election until his retirement in 2018. First elected as a candidate for the Liberal Party, Hamilton-Smith was the state parliamentary leader of the Liberal Party and the Leader of the Opposition in South Australia from 2007 to 2009, and a Minister in the Kerin Liberal government from 2001 to 2002.