Associate Professor Mackay has 51 years of experience as a medical practitioner with civilian and military appointments. He has served as Medical Superintendent and a GP in Biloela in Central Queensland, Surgical Registrar, and Paediatric Surgeon in Brisbane, and Executive Director of Medical Services of South West Health Services Queensland. Associate Professor Mackay also served 50 years in the Australian Defence Forces (ADF) as a General and Trauma Surgeon deploying overseas five times from 1990 to 2005. He has been dedicated to medical education over all his years in medicine, supervising medical students and surgical registrars, teaching 75 trauma courses, and many courses preparing junior doctors for service in the country regions. After retiring from clinical practice, Associate Professor Mackay is delighted to have been given the opportunity to continue to educate medical students at OUM.