David Katz MD, MPH, FACPM, FACP is an authority on nutrition, weight management, and the prevention of chronic disease, and a leader in integrative medicine and patient-centered care. He is a board certified specialist in both Internal Medicine, and Preventive Medicine/Public Health, and Associate Professor (adjunct) in Public Health Practice at the Yale University School of Medicine.

Katz is the Director and founder of Yale University's Prevention Research Center, Director and founder of the Integrative Medicine Center at Griffin Hospital in Derby, CT, and founder and president of the non-profit Turn the Tide Foundation. He was formerly the Director of Medical Studies in Public Health at the Yale School of Medicine for eight years.

Katz holds five U.S. patents and has published over 200 scientific papers, numerous textbook chapters, 15 books to date, and well over a thousand newspaper columns and blog posts.