English Physician William Harvey was one of the key figures of the Medical Renaissance, which coincided with the classical Renaissance. The Medical Renaissance was a period of revitalized interest in the medical discoveries of the Greeks and Romans, which European doctors reexamined to expand their own knowledge base.
Harvey was most famous for his work on heart and blood movement. Although he didn’t come up with the theory of pulmonary circulation, he did create the first quantitative argument for the pulmonary theory. Previously, most doctors believed blood to be food transformed in the liver rather than repumped. He provided the foundation for future work with the heart and circulatory system.