 Corwin was not initially appointed to the Superior Court; he was appointed to the Governor's Council from 1692 to 1714, and served as a judge in the Court of Common Please for Essex County from 1692 to 1708.In that year he was nominated by Governor Joseph Dudley to be an associate justice of the Superior Court following the resignation of John Leverett; he would hold that post until his death in 1717.Corwin's son George (not to be confused with Corwin's nephew, High Sheriff George Corwin) went to Harvard and became minister at the First Church in Salem.