He received a Bachelor of Science degree in mechanical engineering from the Massachusetts Institute of Technology in 1902 and was employed as an executive at the Vermont Marble Company, his family"s business.
He rose to the position of vice president of the company and served as president of the Proctor Trust Company. Proctor was also prominent in other businesses and trade groups, including serving as president of the Clarendon and Pittsford Railroad, and serving on the board of directors of Boston"s Shawmut Bank, the National Association of Manufacturers and the United States Chamber of Commerce. He served as a selectman for the Town of Proctor before winning election to the Vermont House of Representatives in 1912 and 1915, and the Vermont State Senate in 1917, and serving as a delegate to the 1920 Republican National Convention.
In 1922 he was elected Governor and he served from 1923 to 1925.
His term was marked by success at modernizing Vermont"s state government, including authorizing the executive branch to employ a budget director and propose the state budget, and enabling the Governor to remove commissioners and department heads. After his term Proctor returned to Vermont Marble, serving as its president until retiring and becoming chairman of the board of directors in 1952, a position in which he served until his death in Proctor on February 5, 1957.
He is buried in Proctor"s South Street Cemetery.
Proctor was involved in several civic activities, including serving as a member of the Vermont Sanitarium Board of Trustees, and as a Trustee of Middlebury College, Vassar College and the University of Vermont.