Rev. Clark was born in Cambridge, MA to Rev. Jonas and Elizabeth Clark. Rev. Jonas Clark was the Ruling Elder of the Puritan Church in Massachusetts Bay. Rev. Thomas Clark He graduated from Harvard in 1670 and moved to Chelmsford soon after to assist Reverend John Fiske. During King Philip’s War he served as a chaplain of the local army for seven weeks and was paid 6 Pounds for his services. In 1677/8 he was asked to become the Minister in Chelmsford. He was ordained in 1679.