Dr. Walter Willett is Professor of Epidemiology and Nutrition at the Harvard T.H. Chan School of Public Health and Professor of Medicine at Harvard Medical School in Boston, Massachusetts. He served as Chair of the Department of Nutrition at Harvard T.H. Chan School of Public Health for 25 years.

Dr. Willett has published over 1,900 articles, primarily on lifestyle risk factors for heart disease and cancer, and has written the textbook, Nutritional Epidemiology, published by Oxford University Press. He also has four books for the general public, Eat, Drink and Be Healthy: The Harvard Medical School Guide to Healthy Eating, just recently revised and released, Eat, Drink, and Weigh Less, co-authored with Mollie Katzen, The Fertility Diet, co-authored with Jorge Chavarro and Pat Skerrett and Thinfluence, co-authored with Malissa Wood and Dan Childs. Dr. Willett is among the top three most cited persons in all areas of science. He is a member of the National Academy of Medicine and the recipient of many national and international awards for his research.