Benvenuto served one term between 1989 and 1991 as a member of the Connecticut State Senate for the Republican Party for the 36th district.
He was graduated from Greenwich High School before enlisting in the United States Army, which stationed him at Fort Lee, Virginia, from 1952 to 1954.
[6][7] Benvenuto initially worked as a retail clerk in a sports goods store in Greenwich,[8] to support his family.
[11] He was a member of the Knights of Columbus, American Legion, American Legislative Exchange Council, National Conference of Insurance Legislators, Greenwich Council of Youth and Drugs as well as a board member of the Greenwich Boys & Girls Club.
[12] Benvenuto was elected in the Connecticut House of Representatives in 1976, serving six terms for the 151st District, which encompasses Greenwich.