Castell was a Fellow of University College. He became Master of the College in circa 1408. He also held preferment in the Diocese of York with his mastership. In 1411, a sentence of excommunication was issued by the Archbishop of Canterbury, Thomas Arundel, against Castell, Fellows at the College — Robert Burton (later Master of the College), John Hamerton, and Adam Redyford — and the College as a whole, due to Lollardy leanings. An appeal to the Pope against the excommunication was made by the bursar of the College, John Ryvell. Castell survived the controversy and continued as Master until 1420.
- Carr, William, University College, Routledge, 1998. ISBN 978-0-415-18632-2. Chapter IV, The Fifteenth Century: Early Benefactors, Buildings, and Further Statutes (pages 53–73).
- Darwall-Smith, Robin, A History of University College, Oxford. Oxford University Press, 2008. ISBN 978-0-19-928429-0. Pages 45, 49–50, 52, 57, 73–74, 79, 106, 529.
| Master of University College, Oxford
| Chancellor of the University of Oxford
| King's Clerk
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