Allan J. Hamilton, MD, is a Harvard-trained brain surgeon, a renowned horse trainer, a developer of equine-assisted learning programs, and the author of The Scalpel and the Soul,which won a Silver Nautilus Award in 2009. He is professor of neurosurgery at the University of Arizona and a medical script consultant for the hit TV series Grey’s Anatomy. He raises Lippizan horses on a small ranch in the outskirts of Arizona.