Private practice, Scituate, Massachusetts, 1755-1760
Justice of the peace, register of deeds, and probate court judge, Lincoln County, Maine, 1760-1772
Judge, Superior Court of Massachusetts, 1772-1789; chief justice, 1777-1789 (name changed to Supreme Judicial Court in 1780)
Nominated to be Chief Justice of the Supreme Court of the United States, January 26, 1796; confirmed, January 27, 1796; declined appointment
Allotment as Circuit Justice:
Eastern Circuit, Spring 1790-Spring 1792, Spring 1793, Spring 1794-Fall 1794, Fall 1795, Fall 1796, Fall 1797-Spring 1798, Fall 1799-Fall 1800
Middle Circuit, Fall 1792, Fall 1798
Southern Circuit, Fall 1793
First Circuit, April 29, 1802-September 13, 1810