Daniel G. Amen, MD, is a double board-certified psychiatrist, professor, and ten-time New York Times bestselling author. He is one of the world's foremost experts on using brain-imaging tools to help optimize and treat his patients. Amen Clinics have one of the highest published success rates for patients.

His research was listed as one of the Top 100 Stories in Science for 2015 by Discover magazine. He has written and hosted eleven highly popular shows about the brain for public television. His work has been featured in The New York Times Magazine, the Washington Post, and Men's Health and on The Dr. Oz Show and Dr. Phil.

As founding pastor of Saddleback Church with his wife, Kay, Dr. Rick Warren leads a 30,000-member congregation in California with campuses in major cities around the world.

As an author, his book The Purpose Driven Life has been called the bestselling non-fiction hardback in publishing history by Publishers Weekly, having sold more than 33 million copies.

As a theologian, he has lectured at Oxford, Cambridge, Harvard, University of Judaism, and dozens of universities and seminaries. As a global strategist he advises world leaders and has spoken to the United Nations, US Congress, Davos Economic Forum, TED, Aspen Institute, and numerous parliaments.

Rick has also founded the Global PEACE Plan, which Plants churches of reconciliation, Equips leaders, Assists the poor, Cares for the sick, and Educates the next generation in 196 countries.