Thomas J. Calter III is the Massachusetts State Representative for the 12th Plymouth District, which includes the towns of Kingston and Plympton and parts of Plymouth, Duxbury, Halifax, and Middleborough. He is a Democrat.
Calter was elected in 2006 in a short campaign. His predecessor, Tom O'Brien was appointed to the post Treasurer of Plymouth County in August 2006, after it was too late to be taken off the ballot for the primary election. O'Brien won the popular vote in the primary election, but declined the nomination. Calter was selected in a caucus of representatives from the Democratic Town Committees in the district to be the Democratic nominee on the ballot. In the general election, Calter defeated Olly deMacedo by 296 votes.
Calter was raised in Avon, Massachusetts and attended North Adams State College. He earned a Masters in Business Administration from Northeastern University. Calter spent more than 30 years working in the environmental services industry.
Calter and his wife Patty live in Kingston and have three grown children, Ryan, Kerri, and Patrick.