Dr. Mark Stengler is a naturopathic medical doctor and bestselling author. He has served as a medical expert on several television shows and hosted his own popular PBS weekly show, Natural Healing with Mark Stengler. Dr. Stengler also served on a medical advisory committee for the Yale University Complementary Medicine Outcomes Research Project. His current book is The Holistic Guide to Gut Health. He is currently in private practice at the Stengler Center for Integrative Medicine in Encinitas, California.