Allan Hamilton holds four professorships at the University of Arizona College of Medicine - in neurosurgery, radiation oncology, psychology and electrical engineering & computing. His book The Scalpel and the Soul, based on over two decades as a neurosurgeon, explores clinical practice from unconventional perspectives. He is an expert horse whisperer and senior medical consultant on the television show Grey’s Anatomy. 

https://en.wikipedia.org/wiki/Allan_Hamilton