Astronomer, Inventor. Pioneered the science of Astronomy, building the first telescope in the United States, introducing cross-hairs on telescope lenses, and constructing orreries (which are models of planetary motion). During the Revolutionary War he served on the Council of Safety, and in the Pennsylvania Constitution convention. Served as first director of the United States Mint from 1792 to 1795. In 1796 he worked on surveys and commissions that defined the boundries of the states of Pennsylvania, Delaware, Maryland, Virginia, New Jersey and Massachusetts. He taught at the University of Pennsylvania from 1779 to 1782. Philadelphia's Rittenhouse Square is named for him.
Bio by: RPD2