Peter was born and raised at Naracoorte, schooled at Naracoorte and attended secondary school in Adelaide. On completion of schooling, Peter joined EldersGM as a 4th generation Stock and Station Agent. Conscripted for National Service for two years, including some time in Malaysia and Vietnam.
On completion of National Service, he rejoined prior employer at Loxton, Peterborough, Strathalbyn, Meningie and Penola. In 1988, he left Elders to start his own Private Stock and Station company - Thomas DeGaris & Clarkson where he recently retired in 2016 to run a family farm at Bool Lagoon.
Peter is currently President of Coonawarra/Penola RSL, Board member of SSAC since 2014 and a Legatee.