Whittow was a research fellow and lecturer at Oriel College and held faculty positions at the University of Reading and at King's College London, before returning to Oxford in 1998 as a fellow of St Peter's College and University Lecturer in History. He became a fellow of Corpus Christi and University Lecturer in Byzantine Studies in 2009.[2][7] He was Senior Proctor of the university for the 2016/2017 academic year.[8] In November 2017, he was announced as the next Provost of Oriel College, Oxford; he was to take up the post in September 2018.[9][10]
The Making of Orthodox Byzantium, 600–1025 (Basingstoke: Macmillan, 1996) ISBN9781349247653
'Recent Research on the Late Antique City in Asia Minor: the Second Half of the 6th c. Revisited', in Recent Research in Late Antique Urbanism, ed. L. Lavan, JRA Supplementary Series 42 (Portsmouth, RI: Journal of Roman Archaeology, 2001), pp. 137–53 ISBN1887829423
'Early Medieval Byzantium and the End of the Ancient World', Journal of Agrarian Change 9 (2009), pp. 134–53
(ed. with Marc Lauxtermann) Byzantium in the Eleventh Century: Being in Between. Papers from the 45th Spring Symposium of Byzantine Studies, Exeter College, Oxford, 24–26 March 2012 (London: Routledge, 2017) ISBN9781138225039