[1] He graduated from Yale College in 1788, studied law, moved to Vermont, and was admitted to the bar in 1791.

[3] He was a member of the New Hampshire House of Representatives in 1820-1821 and 1824, and was president of the Portsmouth branch of the United States Bank in 1828–1829.

[2] Mason exchanged letters with Nicholas Biddle, the president of the Bank of the United States.

[4] He moved to Boston in 1832 and retired from the practice of law in 1838, but continued as chamber counsel up to the time of his death in 1848.

Senator and former Speaker of the House of Representatives Robert Charles Winthrop) on June 1, 1869 (ancestors of U.S. Secretary of State John Kerry).