Seth had been living in Middletown, MA then moved to Leicester, Worchester County, MA before 1745. He was a leading citizen in Leicester, holding many offices of trust and honor and was prominent during the Revolutionary War.

Seth served as Colonel in the Revolutionary War and had command of a company of Minute Men at Bunker Hill. He started off as a Captain in the 8th Massachusetts Province. He was a member of the General Court of MA, a Representative from the town of Leicester and a Senator for the County of Worcester. He was a member of the Constitutional Convention of 1779 and Colonel of the Regiment after the Revolutionary War. At the Battle of Bunker Hill, he marched as Captain of the Leicester Minute Men. 137,138

Seth started the history of the family (see "Justice of Peace Book"). After his death it was carried on by other members of the family.