[1] He completed his education at Barre Academy, and began a business career in his father's East Calais store in 1868.

[1] In 1885 Dwinell was an original incorporator of the Vermont office of the Farmers' Trust Company, and was chosen its President.

[1] Dwinell's other business interests included serving as a member of the board of directors for Montpelier's Wetmore & Morse Granite Company and First National Bank, and a Vice President of the Montpelier Building & Construction Company.

[1] A Republican, Dwinell held several local offices in Plainfield, including Town Clerk and Treasurer.

[1] In 1898 Dwinell became a Loan Inspector for Montpelier's National Life Insurance Company.