Mark Jit is professor and chair of the Department of Global and Environmental Health at New York University. He previously worked as a professor at the London School of Hygiene & Tropical Medicine (LSHTM), where he was head of the Department of Infectious Disease Epidemiology & Dynamics and co-director of the Global Health Economics Centre (GHECO). He holds honorary appointments at LSHTM, the University of Hong Kong (HKU) and the National University of Singapore (NUS). His research focuses on epidemiological and economic modelling of vaccines to support evidence-based public health decision making. Mark has published papers covering a range of vaccine-preventable or potentially vaccine-preventable diseases including COVID-19, measles, HPV, pneumococcus, rotavirus, influenza, Group B Streptococcus, dengue, EV71 and RSV as well as methodological papers advancing the ways vaccines are evaluated. This work has influenced many of the major changes to immunisation policy in the UK and globally. He also organises or contributes to academic and professional courses on vaccine modelling, economics and decision science around the world.