Dr. Greg grew up in eastern Sydney. He went to Waverley College Christian Brothers at Bondi. He studied medicine at the University of Sydney. He then spent three years at Royal Prince Alfred Hospital , working in various departments as a resident doctor. Following that he worked at the Children's Hospital (when it was at Camperdown). Here he completed a certificate in post graduate training for paediatrics. He then worked at St. Margaret's Hospital for Women at Darlinghurst and obtained his Diploma in Obstetrics. Following this he practised in Bathurst for six months and Coogee for twelve months. Passing his examinations for Fellowship to the Royal Australian College of General Practitioners.

Dr. Greg moved to Oatlands in July 1994 and has continued to work and live as a family doctor in Oatlands since that date.

He enjoys all aspects of medical practice, but especially paediatrics, antenatal care and preventative medicine.

Outside of medicine he spends most of his time with his wife and three girls. He loves to watch the 'Roosters' win.