Mark Jit is professor of vaccine epidemiology at the London School of Hygiene & Tropical Medicine (LSHTM) and visiting professor at the School of Public Health, University of Hong Kong. His research group focuses on epidemiological and economic modelling of vaccines to support evidence-based public health decision making. He has published over 190 papers covering a range of antigens including measles, HPV, pneumococcus, rotavirus, influenza, dengue, EV71, RSV and COVID-19 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.