Clossy, an Irish physician, previously at Trinity College, Dublin, gave the first anatomy classes and dissections at King’s College in New York City (now Columbia) in 1763. Clossy worked closely with other King’s College faculty, including Samuel Bard, to professionalize the study of medicine in the United States. He is understood to have dissected the bodies of deceased slaves in his lectures. His Observations, which he wrote during the 1750s, was the first treatise on anatomy and pathology published by a physician working in America. Clossy had it printed in London. Some of Clossy's innovative observations bear a relationship to similar kinds of observations made by Morgagni (1761). Clossy had his book printed in London. He returned to Europe in 1780