Simon Hay is Professor of Epidemiology at the University of Oxford. He is an outstanding research scientist and a global leader in tropical medicine. He has made significant contributions to the epidemiology of malaria and is recognised as a global authority on the mapping of infectious disease. The world-leading cartographic work of Professor Hay is always focussed on significant problems in international health. His work is also characterised by its far-reaching impact on international policy, making him an effective champion of translating research into societal benefits and his election as the 52nd President of the Royal Society of Tropical Medicine and Hygiene underscores his standing in tropical medicine.