Peter Duncan was born in Melbourne and went to the University of Adelaide, where he studied law and was co-editor of the student newspaper On Dit in 1968.
[1] In state parliament Duncan served as 41st Attorney-General of South Australia from 1975 until 1979, and then as Minister for Health until the defeat of the Corcoran Labor government at the 1979 election.
After leaving the ministry in 1990, he became Parliamentary Secretary to the Attorney-General in December 1991, a post he held until Labor lost office.
[3] It was reported that this had occurred in the wake of the failure of his plastic recycling business Omnipol.
[4] He was subsequently ordered to stand trial on three counts in the South Australian District Court.