Jonathon Sullivan MD, PhD, FACEP, SSC is an emergency physician, research scientist, author, and the owner of Greysteel Strength and Conditioning, a Starting Strength Affiliate Gym in Farmington Michigan. He is focused on the science and practice of strength training to combat the degenerative diseases of aging. He is a former US Marine and a 3d Dan in Tang Soo Do. Sully served as an Associate Professor of Emergency Medicine at Wayne State University, where he saw patients, taught clinical medicine, and conducted neuroscience research.
He retired from medical practice and academics in 2017 to devote himself to a full-time coaching practice and writing. His YouTube channel can be found at YouTube.com/Greysteel, and his book “The Barbell Prescription,” with Coach Andy Baker, is available from Amazon or from the Aasgaard Company.