Secretary to the Continental Congress (1774-89).
Teacher, Biblical scholar, trader. Through his relationship with Franklin, he became a tutor at the Philadelphia Academy.
Dealt heavily in Indian affairs. Acted as recorder at the treaty of Easton. Wrote the controversial essay An Enquiry into the Causes of Alienation of the Delaware and Shawanese Indians from the British Interest, for which Franklin arranged publication (1759).
Deeply involved in Pennsylvania politics, especially concerning conflicts with Great Britain.
Born in County Derry, Ireland. Married Ruth Mather. Married Hannah Harrison.