Matilda Allen, MSc, is a public health specialist with experience of leading and publishing high-profile research work, developing multiagency stakeholder networks, and providing expert advice and guidance across the health and care system at local, regional, and national levels in the United Kingdom. Her work has focused on tackling health inequalities through action on the social determinants of health, with a particular interest in how these can be tackled through health care practice and the policies of health care institutions. Allen holds a master’s degree from the London School of Economics and Political Science in philosophy and public policy, and a master's degree in public health from the London School of Hygiene and Tropical Medicine. She was a 2021–22 Commonwealth Fund Harkness Fellow in Health Care Policy and Practice.