James O. Hill is Professor of Pediatrics and Medicine and Director of the Center for Human Nutrition at the University of Colorado at Denver. He holds a Ph.D. from the University of New Hampshire in Physiological Psychology. He is President of the American Society for Nutrition and a Past President of the Obesity Society (TOS). He served as Chair of the first World Health Organization Consultation on Obesity in 1997 and was a member of the Expert Panel on Obesity of the National Institutes of Health that developed the first U.S guidelines for the treatment and prevention of obesity.

Dr. Hill has published more than 350 scientific articles and book chapters in the area of obesity. Many of these focus specifically on the importance of physical activity in weight management. He is the recipients of the 2007 TOPS award from The Obesity Society. He has received the Centrum Center and McCollum awards from the American Society for Nutrition. Dr. Hill is a co-founder of the National Weight Control Registry, which tracks people who have succeeded at long-term weight loss. He is co-founder of America on the Move, a national weight gain prevention initiative that aims to inspire Americans to make small changes in diet and physical activity.