Sally Hargreaves is a Professor of Clinical Public Health and Section Head for Global Health at the Institute for Infection and Immunity, City St George's. She leads a multi-disciplinary team, The Migrant Health Research Group, with a research focus on strengthening life-course immunisation, health promotion, and screening in migrant populations globally. She has 20 years' experience working in a variety of research and consultancy posts relevant to designing and evaluating complex interventions in healthcare, with expertise in participatory research, community engagement and involvement (CEI), and co-design. She is a Senior Technical Advisor at the World Health Organization, and involved in global dialogue around the promotion of Universal Health Coverage and tackling health inequalities in migrant populations through The Lancet Migration initiative. Previously, she worked overseas with Médecins Sans Frontières in Nigeria, Russia, and Central Asia.