Career
He served as a Senator for from 1 July 1975 to 30 June 1978, and then again from 9 August 1978 until 1 February 1994, and was President of the Senate from 17 February 1987 to 1 February 1994. After leaving Parliament, Sibraa was the Australian High Commissioner to Zimbabwe from March 1994 until February 1998. Sibraa is currently a special counsel for the public relations and government relations firm Wells Haslam Strategic Public Affairs Pty Limited.