In McNeish's book Dance of the Peacocks, he is noted as a member of what was to be described in British academe as the Oxford "New Zealand Mafia",[6] a loose-knit group of extraordinarily gifted young men from New Zealand who studied at Oxford University, many as Rhodes Scholars, before the Second World War. The link between them was to endure for the rest of their lives. The group included John Mulgan, Dan Davin, James Munro Bertram, Desmond Patrick Costello, Charles Brasch, Norman Davis and Ian Milner. McNeish describes Bennett as "at an angle, separated by the exuberance of his scholarship, his saintliness, and his forgetfulness ... he considered himself lucky to have received the Scholarship [to Oxford], since he forgot to include any testimonials with his application".[7]
McNeish also mentions Bennett's work with the British Information Service in America during World War II: asked to help out for a few weeks, he remained for the duration, returning to Oxford in 1943 and at the end of the war.[8]
He became best known as a scholar of Middle English literature. He was editor of the journal Medium Aevum from 1957 to 1981, having earlier assisted his predecessor, Charles Talbut Onions, and was a colleague of C. S. Lewis at Magdalen College, Oxford.[9] In 1964 he succeeded Lewis as Professor of Medieval and Renaissance English at Cambridge University. He was elected a Foreign Honorary Member of the American Academy of Arts and Sciences in 1976.[10] His most substantial work was the volume Middle English Literature for the Oxford History of English Literature series, which was completed after his death by Douglas Gray and published in 1986. Other works include The Parlement of Foules: An Interpretation (1957); Chaucer's Book of Fame: An Exposition of "The House of Fame" (1960); and Chaucer at Oxford and at Cambridge (1974). Bennett also edited several volumes, including The Knight's Tale by Chaucer, Early Middle English Verse and Prose (1966, with G. V. Smithers), and the collection Essays on Malory (1963).[9]
Piero Boitani & Anna Torti, eds. (1983) Literature in Fourteenth-Century England: The J. A. W. Bennett Memorial Lectures, Perugia, 1981–1982. Tübingen: Narr; Cambridge: Brewer.
P. L. Heyworth, ed. (1981). Medieval Studies for J. A. W. Bennett: Aetatis Suae LXX. Oxford: Clarendon Press.