Medical doctor specializing in infectious disease epidemiology and international health. Founded the International AIDS Vaccine Initiative. Currently Chief Executive Officer of Gavi, The Vaccine Alliance. Previously, worked for US Centres for Disease Control, the Carter Centre and has consulted or worked in over 25 countries in Asia, Africa and Latin America. Author of over 85 publications and writes extensively on infectious disease and serves as media commentator on vaccines, health technology development and global health issues. Steward of the Platform on Shaping the Future of Health and Healthcare and Member of the Centre for the Fourth Industrial Revolution Advisory Board at the World Economic Forum.