 On Matthias' death he became Master on 9 April 1642.He has been grouped as one of a ""sad procession of non-entities"" who, with few exceptions in the period between the Founder's death and when the College was reconstituted in 1857, on becoming Warden or Master, had as their chief object to lead the pleasantest life possible with little regard to furthering Alleyn's directions to provide every poor scholar with adequate preparation for the world.He died on 15 March 1668/1669 and was succeeded in the post by the surgeon Raph Alleyn who had served as Warden in the period that Thomas had been Master.