He also opened a successful common school in Stratford shortly after his arrival in 1723, and also boarded and tutored the sons of prominent New York families to prepare them for college. He also trained Yale students for the Anglican ministry at his parsonage in Stratford, converting many of them from Puritan denominations, as well as training Anglicans in a kind of small seminary. Between 1724 and his death in 1772, Johnson mentored 63 Yale graduates who intended to take Anglican orders. His disciples resided in all 13 states and Canada by the time of the Revolution.