Mark Manary, MD, is the James P. Keating Professor of Pediatrics and a professor in pediatric emergency medicine at WashU Medicine. An expert in childhood malnutrition, Manary helped develop a peanut-based ready-to-use therapeutic food (RUTF) that has been successfully used to treat malnourished children worldwide. His nonprofit Project Peanut Butter produces and distributes the supplemental food in Malawi, Sierra Leone and Ghana. His research in malnutrition and his advocacy with United Nations agencies has successfully reshaped international policy and practice.