For some years prior to 1663, when he entered the Jesuit order, he held the chair of philosophy and divinity in the English College at Douai.
He was afterwards successively lecturer in divinity in the Jesuit college at Liège and prolocutor of the order at Paris, where he took the fourth vow on 2 February 1673.
[1] Warner claimed that Titus Oates had offered to sell to the Jesuits his manuscript narrative which later became the backbone of the alleged Plot, early in August 1678.
[2] He participated in the eleventh general Jesuit congregation held in Rome from 21 June to 6 September 1682 and served as rector of St. Omer from 1683 until 1686.
[3] At the time of the Glorious Revolution in 1689 he followed James to France, though detained at Gravesend where he needed forged papers to escape.