Mark Stengler, N.M.D., is a naturopathic medical doctor, best-selling author, TV host, and former advisor to the Yale University Complementary Medicine Outcomes Research Project.

He is the author of such books as The Natural Physician's Healing Therapies, and co-author of Prescription for Drug Alternatives and Prescription for Natural Cures.

He was the host of Natural Healing with Dr. Stengler, a series of health shows that played on PBS for several seasons and continues to be seen on cable stations nationwide. He practices what he preaches at his state-of-the-art Stengler Center for Integrative Medicine in Encinitas, California,