Private practice, Braintree, Massachusetts, 1790
Private practice, Haverhill, Massachusetts, 1790-1791
Justice of the peace, Essex County, Massachusetts
Private practice, Washington, D.C., 1791-1800
City land commissioner, Washington, D.C., 1800-1801
Reporter, Supreme Court of the United States, 1802-1815
Professor of law, Columbian College, 1826-1828