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 Lead with Your Heart and Zen Mind, Zen Horse. He is a professor of neurosurgery at the University of Arizona, the Executive Director of The Arizona Simulation Technology and Education Center at the University of Arizona College of Medicine, and a medical consultant to ABC's Grey's Anatomy. Additionally, he has appeared on television programs including MSNBC, CNN, PBS, and the Discovery Channel and has been featured in national newspapers such as the New York Times, USA Today, and Newsweek magazine. He raises Lipizzan horses on a small ranch on the outskirts of Tucson, Arizona.