Bill Marmion was born on 22 May 1954 in Kalgoorlie, Western Australia, Australia. He has been married to Katelyn Dorothy Betti since 20 March 2004. They have two children. He was previously married to Carolyn Anne Pascoe.
Member of the Legislative Assembly of Western Australia for Nedlands (6 September 2008 - ), Deputy Leader of the Liberal Party of Western Australia (13 June 2019 - 24 November 2020).