Moseley's principal interests are in the mediaeval and early modern periods, particularly Chaucer, Sir John Mandeville, Shakespeare, Milton, and the European emblem.

He also wrote A Brief Architectural Guide to the Church of St Mary the Virgin, Swaffham Prior (1980), and with the poet Clive Wilmer edited Cambridge Observed: An Anthology (1998).

In 2022 his To Everything a Season: The View from the Fen, a closely and affectionately observed account of the changing year in East Anglia, was published by Merlin Unwin Books.

This, the first explicitly religious book he has written, picks up once more the journey/wandering/pilgrimage theme that fascinates him, but is also a sustained meditation on the nature and force of memory in a place, and the possibility of knowledge and certainty.

Moseley's influence as a teacher and lecturer is shown in his long association with the Cambridge International Summer Schools, where his Programme Directorship in English Literature saw the numbers of courses and registrants expand considerably, and the foundation of a distinct Shakespeare Summer School which after his retirement was directed by Catherine Alexander and Fred Parker.

[8] He was a founding partner of and Literature Editor for Humanities-ebooks, a digital academic publisher committed to lower prices for readers and higher royalty payments for authors.

He has three times been an Evelyn Wrench Speaker for the English Speaking Union of the United States (1993, 1995, 2000), is a frequent lecturer on study cruises for Saga, Fred.

Olsen Cruise Lines, and Voyages of Adventure, and has been a plenary speaker at conferences in Lisbon, Bucharest, Innsbruck, and Szeged.