HEIDI J. LARSON, PhD, is Professor of Anthropology, Risk, and Decision Science and Director of the Vaccine Confidence Project at the London School of Hygiene & Tropical Medicine; she holds a concurrent position as Clinical Professor of Health Metrics Sciences at the University of Washington. She was previously an Associate Professor in International Development at Clark University and a Research Fellow at the Harvard School of Public Health's Center for Population and Development Studies. Dr. Larson was named one of The BCC's Top 100 Women of 2021 for her work on vaccine confidence.