Conwell took up the post at an advanced age and spent much of his time there feuding with the lay trustees of his parishes, especially those of St. Mary's Church in Philadelphia. When Conwell removed and excommunicated William Hogan, a controversial priest at St. Mary's, the parish trustees instead rejected Conwell's authority, creating a minor schism. The two sides partially reconciled by 1826, but the Vatican hierarchy believed Conwell had ceded too much power to the laymen in the process and recalled him to Rome.