He was known to be a reformer, and in February 1565 wrote to the then Archbishop of Canterbury complaining of "profane comedies or tragedies".
Returning to England after the death of Queen Mary, he was admitted Margaret professor of divinity (1559).
[2] Beaumont was a prominent figure in the movement of the Calvinists at Cambridge against conforming to the ordinances of Elizabeth I and Matthew Parker.
He subscribed to the articles of the Convocation of 1563, and, both by signing a request to the synod concerning rites and ceremonies, and by voting with the minority in convocation for the six articles on discipline, he supported the anti-ritualistic side in the church In a letter to Parker, of 27 February 1564, he disapproved of dramatic representations among the students.
[2] He expelled John Sanderson for doctrinal reasons and contumacy;[3] and prevented Walter Travers from gaining a fellowship also for problems of attitude, though Travers survived at Trinity, to be expelled by John Whitgift, the next Master.