Harold G. Koenig, MD, MHSc., completed his undergraduate education at Stanford University, his medical school training at the University of California at San Francisco, and his geriatric medicine, psychiatry, and biostatistics training at Duke University Medical Center. He is board certified in general psychiatry, geriatric psychiatry and geriatric medicine, and is on the faculty at Duke as Professor of Psychiatry and Behavioral Sciences, and Associate Professor of Medicine, and is on the faculty at King Abdulaziz University, Jeddah, Saudi Arabia, as a Distinguished Adjunct Professor. He is also a registered nurse. Dr. Koenig is Director of the Center for Spirituality, Theology and Health at Duke University Medical Center, and is considered by biomedical scientists as one of the world's top experts on religion and health.