Reuben was born in 1736 and died in 1785. He was the son Giles Ellsworth and Hanna Stoughton. Reuben married Elizabeth Moore. Ms. Moore was born in 1743 and died in 1798. Reuben had an older Uncle David who was also a clockmaker. David was born in 1709 and lived until 1782. It is logical to assume that David trained his nephew. This clock is currently the only known signed example made by Reuben.