Astronomer who focused on the planet Venus and taught astronomy at the University of Pennsylvania. He was also the first American to sight Uranus, which he did in 1784.
He formed a scientific instrument shop when he was 19 years old.
He was a member of the American Philosophical Society and he was the first director of the United States Mint, which produces circulating coinage for the United States to conduct its trade and commerce.
He married Elanor Coulston on February 20, 1766.
He was mentioned in the book "Notes on the State of Virginia" written by Thomas Jefferson.