Kennedy worked as a supervisor in the miscellaneous small parts stockroom[3] for Gillette in Canton, Massachusetts, before seeking public office.
Kennedy first sought the office of Treasurer in 1952, losing the Democratic primary to Foster Furcolo.
After serving three terms as Treasurer, Kennedy sought the office of Governor of Massachusetts in 1960.
John Kennedy of Canton (The State Treasurer) sought the office of governor.
Two John Kennedys (from Everett and Plymouth) both sought seats in the Massachusetts State House.