Mark Jit is professor of vaccine epidemiology in the Department of Infectious Disease Epidemiology at the London School of Hygiene & Tropical Medicine (LSHTM), as well as 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. 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.