David was a founding partner of GRM International (now Palladium). He retired as Managing Director in 2000 but has remained on the Board. David has been President of the Australian Rugby Union, and a director of AACo and Graincorp. David was Chairman of the Australian Rural Leadership Foundation from 2000-08 and served on the Board of Export Finance Insurance Corporation (EFIC) from 2007-10. He was President of the National Farmers Federation of Australia from 2006-10, President of the Australian Rugby Union from 2013-15, Director of Foodbank Queensland, and received a Member of the Order of Australia honour for services to agriculture, communities, and sport in 2014.