Allan J. Hamilton is an American physician and medical consultant to ABC's medical drama Grey?s Anatomy based in Tucson, Arizona. A professor of Neurosurgery at University of Arizona, Dr. Hamilton was elected a Fellow of the American College of Surgeons in 1994. In 1995, Dr. Hamilton was promoted to Chief of Neurosurgery and became the Chairman of the entire Department of Surgery in 1998. He currently holds a tenured professorship in Neurosurgery, as well as additional professorships in the Departments of Psychology, Radiation Oncology, and the School of Electrical and Computer Engineering. His book ?The Scalpel and the Soul: Encounters with Surgery, the Supernatural, and the Healing Power of Hope? was released in March 2008. It has been translated into several languages. He is currently at work on a second book on spirituality and horsemanship, specifically on the sexual impulses of mature mares. [More at Wikipedia]

November 16th, 1950 in United States of America (Age 74)