Stephen MacMahon is Principal Director of The George Institute for Global Health and Professor of Medicine at both the University of Oxford and the University of New South Wales. His research has mainly involved large-scale epidemiological studies and clinical trials across a range of diseases including coronary disease, cerebrovascular disease, pulmonary embolism and diabetes. In 1999, he founded The George Institute, which today employs more 700 people across four R&D centres in Australia, China, India and the UK. He also founded the social enterprise, George Health Ltd, to develop affordable, scalable solutions for the management of chronic diseases in the world's largest emerging economies. He is a fellow of the British Academy of Medical Science, the Australian Academy of Science and the American College of Cardiology. In 2016, he was made an Officer of the Order of Australia (AO) for his research and contribution to improved healthcare in resource-poor settings.