I read Theology at St. Andrews, specialising in New Testament and Church History. From there I went to Cambridge, where I completed a postgraduate degree and trained for the Anglican priesthood. After eight years in parochial ministry in North London and Oxfordshire, I moved to Birmingham in 1985, teaching at Queen’s College until 1993, when I joined the department. I have a doctorate from the University of Leiden, The Netherlands.
I have been Executive Editor of the International Greek New Testament Project since 1987. I am editor of the series Texts and Studies. Contributions to Biblical and Patristic Literature (published by Gorgias Press) and Arbeiten zur neutestamentliche Textforschung (published by De Gruyter).
In 2012 I was elected a Fellow of the British Academy.