For thirty years he was Rector of Stevenage, Herts, England. All six of his children are named on a tablet in the Church in memory of the father's service there.

TABLET: Here lies William Pratt, Bachelor of Sacred Theology, and most illustrious rector of this church during thirty years. He had three sons, John, William and Richard, and the same number of daughters, Sarah, Mary and Elizabeth, by his renowned wife, Elizabeth. At length, the course of his life being run, and his age becoming burdensome, he emigrated to the Celestial cournty in the year of salvation 1629, aged 67.