William Harvey, English doctor, mid 17th century.
© Science Museum / Science & Society Picture Library
William Harvey (1578-1657) greatest work, 'Anatomical Treatise on the Movement of the Heart and Blood in Animals', was written in 1628. In this he describes his analysis of the movements of the heart and blood. Attached to St Bartholomew's Hospital, London, Harvey was also physician to both James I and Charles I. Best known for discovering the circulation of the blood, made public in 1616, Harvey also superintended the physical examination of women accused of witchcraft, and built a library for the Royal College of Physicians.