After his PhD he was employed by the British Library to carry out research on Codex Sinaiticus and he has published a book entitled Scribal Habits in Codex Sinaiticus (2007). He has also recently re-edited the edition of the Greek New Testament of Samuel Prideaux Tregelles, and carried out significant work on the legal language used in and outside the New Testament.

Currently he is the Research Fellow in New Testament Text and Language at Tyndale House, Cambridge and the John W. Laing Fellow at St Edmund’s College, Cambridge. He is married to Marion, with six children.