The doctors who have successfully guided participants in ABC’s Extreme Weight Loss & The Biggest Loser series share their insights on Moments with Marianne.

Dr. Holly Wyatt earned her medical degree from Baylor College of Medicine in Houston, Texas, and completed her internal medicine and endocrinology training at the University of Colorado. She has been involved in the field of obesity, weight management and metabolism her entire career and personally struggled with her weight and maintaining a reduced healthy body weight earlier in her life.

Dr. James Hill is an internationally recognized leader in weight management. He has a Ph.D. from the University of New Hampshire in physiological psychology. Dr. Hill has spent the past 35 years conducting research to understand why obesity develops and how it can be prevented and treated. He was a co-founder of America On the Move and a co-founder of the National Weight Control Registry.