Sir William Petty FRS (26 May 1623, in Romsey – 16 December 1687) was an English economist, physician, scientist and philosopher. He first became prominent serving Oliver Cromwell and the Commonwealth in Ireland. He developed efficient methods to survey the land that was to be confiscated and given to Cromwell's soldiers. He also remained a significant figure under King Charles II and King James II, as did many others who had served Cromwell.
In the celebrated case of Anne Greene, who survived a hanging, the physicians intending to dissect the cadaver were Ralph Bathurst, William Petty, Thomas Willis, and Henry ClerkeWilliam Petty in Wikipedia