Jonathon M Sullivan MD, PhD, SSC is the owner of Greysteel Strength and Conditioning, a coaching practice and Starting Strength Gym devoted to barbell-based training for Masters, in Farmington, MI. Dr. Sullivan conducts semi-private barbell coaching and programming for adults in their 50s, 60s, 70s and beyond. He is also Associate Professor of Emergency Medicine at Wayne State University/Detroit Receiving Hospital, a Level I Trauma Center where he has worked in patient care, teaching, and research for over twenty years. Until his retirement from basic research in 2012, he was Associate Director of the Cerebral Resuscitation Laboratory, where he conducted basic research in molecular mechanisms of neuronal salvage and repair in the setting of cardiac arrest, stroke, and trauma. He is the author of several dozen research articles, abstracts, and book chapters in the emergency medicine and neuroscience literature, as well as articles on strength training which can be found online at Starting Strength. He has served on several committees for the Starting Strength Coaches Association, and participated in the development of the Maintenance of Certification process for Starting Strength Coaches. He is a former US Marine, holds the rank of 3rd Dan in Tang Soo Do, and has been known to publish the occasional science fiction short story.

He lives in Farmington Hills, MI, with his wife, three ungrateful cats, and a wooded lot full of raccoons, skunks, possums, foxes, herons, and ducks.