He was born at "Tremorvah", Millicent, a son of Ralph Edwin DeGaris and Mrs DeGaris née Curgenven.
He served as councillor with the Millicent District Council from 1948 to 1954.
He was elected in December 1962 for the Liberal and Country League (Liberal Party) to a Southern district seat in the Legislative Council, and remained a member, through the reversion in 1975 of that House to a single constituency, until November 1985. He served as Chief Secretary, Minister for Health and Minister for Mines from April 1968 to June 1970. As Leader of the Legislative Council, he clashed with Premier Steele Hall, a fellow Liberal, over the latter's plan to reform the franchise of the Upper House, a move that severely disadvantaged his own party's gerrymander.
He married Norma Florence Willson, of Penneshaw, Kangaroo Island, around 1950.
- The "DeGaris" is problematical. Many newspaper reports and official documents use "De Garis", and that was how his father wrote out his own name. Once, this hardly mattered, but now any computer search must explore both possibilities.
- a.k.a. High School. His father attended Prince Alfred College (PAC), so he almost certainly did too.
- "Passing of Mr. L. A. DeGaris". The Narracoorte Herald. SA. 29 March 1951. p. 12. Retrieved 15 December 2014 – via National Library of Australia.
- "Death of W/O Bill DeGaris". Border Watch. Mount Gambier, SA. 15 December 1945. p. 1. Retrieved 15 December 2014 – via National Library of Australia.
- "Former Member of the Parliament of South Australia". Retrieved 12 December 2014.
- "Greener fields for Dunstan?". The Canberra Times. 17 August 1968. p. 2. Retrieved 15 December 2014 – via National Library of Australia.
- He continued to defend, or at least attempt to minimise, what Flinders University academics Neal Blewett and Dean Jaensch termed as the Playmander. "Gerrymander in SA". The Canberra Times. 31 August 1976. p. 2. Retrieved 15 December 2014 – via National Library of Australia.
- "It's an Honour". Australian Government. Retrieved 15 December 2014.
| Father of the Parliament of South Australia