Dr. John Collins Warren graduated from Harvard College in 1797, then began the study of medicine with his father, Dr. John Warren. In 1799, he went abroad, continuing his medical studies in London and Paris, working with such luminaries as the pioneer anatomist Sir Astley Cooper (1768-1841). He received an honorary medical degree from Harvard in 1819.On his return to America in 1802, Dr. John Collins Warren entered into partnership with his father and also began to assist him with anatomical lectures, dissections, and demonstrations at Harvard Medical School. He was named Adjunct Professor of Anatomy and Surgery in 1809, then, at his father's death, assumed the Hersey Professorship of Anatomy and Surgery. He held that post until he was granted professor emeritus status in 1847. Dr. Warren was also the first dean of the Medical School and promoted its removal from Cambridge to Boston to obtain better access to clinical facilities. Over the course of his long career, he assembled an extraordinary teaching collection of anatomical and pathological specimens. He presented it to the Harvard Corporation in 1847 along with $5000. This was the beginning of the Warren Anatomical Museum.