Dr. Rick Warren is pastor, author, global strategist, theologian, and philanthropist. His book The Purpose driven Life has been called the bestselling non-fiction hardback in publishing history by Publishers Weekly, having sold more than 32 million copies. Warren founded Saddleback Church in 1980 with his wife, Kay. In addition to a 120-acre campus in Lake Forest, CA, the church has ten satellite campuses in Southern California and three international campuses. Dr. Daniel G. Amen is a physician, double-board certified psychiatrist, teacher and eight-time New York Times bestselling author. Widely regarded as one of the world's foremost experts on applying brain imaging science to everyday clinical practice, Amen is the founder of Amen Clinics in Newport Beach and San Francisco, Calif.; Bellevue, Wash.; Reston, Va.; Atlanta, Ga.; and New York City. His work has been featured in numerous media outlets, including "The Dr. Oz Show," "ABC World News," "20/20," Newsweek, TIME, The Huffington Post, BBC, London Telegraph, Parade Magazine, New York Times and Cosmopolitan. Additional information is available at http://www.danielplan.com. Dr. Mark Hyman is a practicing family physician, a six-time No. 1 New York Times bestselling author, and an internationally recognized leader, speaker, educator and advocate in his field of Functional Medicine. He is also the founder and medical director of The UltraWellness Center, chairman of the board of the Institute for Functional Medicine, a medical editor of The Huffington Post and a regular medical contributor on Katie Couric's TV show, "Katie." For more information, visit http://www.danielplan.com/.