Philadelphia clockmaker and engraver.

Director of the Philadelphia Contributorship (1759-65). Invested in Nova Scotia lands (1765). Member of the American Philosophical Society (1768). Member of the Philadelphia committee of correspondence (1774). Long-time friend of Franklin and executor of Franklin’s last will.

Son of Joseph and Sarah (Koster) Duffield. Married Catherine Parry in 1751; seven children, including Dr. Benjamin Duffield.