Born in Metz, where his father was director of the local mint, Barbé-Marbois tutored the children of the Marquis de Castries. In 1779 he was made secretary of the French legation to the United States. In 1780, Barbé-Marbois sent a questionnaire to the governors of all thirteen former American colonies, seeking information about each state's geography, natural resources, history, and government. Thomas Jefferson, who was then finishing his final term as Virginia's governor, responded to this query with a manuscript that later became his famous "Notes on the State of Virginia".