What is William Harvey famous for?

William Harvey is famous for his groundbreaking work in anatomy and physiology, particularly for his discovery of the circulation of blood in the human body. In 1628, he published "De Motu Cordis," where he detailed how the heart pumps blood through a closed system of vessels, challenging the prevailing Galenic theories of the time. His work laid the foundation for modern cardiovascular science and significantly advanced the understanding of human anatomy.