Heggie was born in Melbourne, Victoria in 1950,[2] and educated at Bonbeach High School. He attended the University of Melbourne and graduated with a Bachelor of Medicine and Bachelor of Surgery. On the completion of his first degree he relocated to Sydney where he worked as a research pharmacologist before returning to Melbourne. In 2001, after 20 years in Melbourne, he relocated to the Northern Territory with his family.[3]
Between 2016 and 2022, Heggie served as the Chief Health Officer and executive director of Public Health and Clinical Excellence in the Northern Territory. He played a significant role during the COVID-19 restrictions in Australia and served on numerous boards, committees and councils locally and nationally.[3]