Biography:

Du Ponceau was a Philadelphia lawyer who arrived in Portsmouth, N.H., from France in 1777, achieved early prominence as an aide to von Steuben, and as secretary to Robert Livingston, Secretary of Foreign Affairs for the Congress in 1781. Du Ponceau was admitted to the Philadelphia Bar in 1785 where his familiarity with both American and European law brought him an important practice. His intellectual interests included both history and linguistics and he published extensively in both fields. He was a member and officer of both the American Philosophical Society and the Historical Society of Pennsylvania.