Gregory has represented Australia as an Ambassador and High Commissioner in West Africa, and as a diplomat in China, Japan and the United Nations.
As Australia’s first-appointed Threatened Species Commissioner, Gregory wrote and implemented Australia’s first Threatened Species Strategy and first Threatened Species Prospectus. He worked at SES levels in the Departments of Foreign Affairs and Trade, Environment, Climate Change, and Indigenous Affairs. As a not-for-profit CEO, he led, grew and reformed a national Indigenous charity. He is an experienced Indigenous champion and career mentor for First Nations peoples.
Gregory speaks French and Mandarin. He has a First Class Honours Degree in Economics and a Masters Degree in Foreign Affairs and Trade.
Gregory is an Associate Adjunct Professor at the University of Canberra's Centre for Applied Ecology. He and his family own and manage a 50 hectare conservation property in NSW.
Gregory is the founder and Managing Director of Lyrebird Dreaming Pty Ltd. In 2023, he co-designed and wrote a Reconciliation Action Plan for the National Capital Authority; an Indigenous Employment Strategy and Indigenous Career Investment Program for Australia's Parliament House; and an Aboriginal Community Inclusion Strategy for the Cooks River Alliance. Gregory is currently conducting a review of the Board of SydWest Multicultural Services.