- Emeritus Fellow, All Souls College (from 1983 to 2015)
- Professor of the Archaeology of the Roman Empire and Fellow, All Souls College (from 1966 to 1983)
- Reader (1955-63) then Professor of the Archaeology of the Roman Provinces, Institute of Archaeology, University of London (from 1955 to 1966)
- Lecturer in Archaeology, Manchester University (from 1954 to 1955)
- Master, Lancing College (from 1945 to 1954)
- National Fire Service (from 1940 to 1945)
- Master, Epsom College (from 1938 to 1940)
- Undergraduate, Magdalene College, Cambridge (to 1938)
- (with J. J. Wilkes) Strageath: excavations within the Roman fort (Society for the Promotion of Roman Studies, 1989)
- (with F. A. Lepper) Trajan’s Column (Alan Sutton, 1988)
- Verulamium Excavations, vol. I (1972), vol. II (Society of Antiquaries of London, 1983), vol. III (Oxford University Committee for Archaeology, 1984)
- Excavations at Canterbury, vol. VII (Kent Archaeological Society, 1982)
- (with J. K. St Joseph) Roman Britain from the Air (CUP, 1983)
- Excavations on the Roman and Medieval Defences of Canterbury (Kent Archaeological Society, 1982)
- Britannia, a history of Roman Britain (Routledge & Kegan Paul, 1967; 4th edn, The Folio Society, 1999)
- (ed.) Problems of the Iron Age in Southern Britain (University of London, Institute of Archaeology, 1961)
