A. J. MacKenzieA. J. MacKenzie is the pseudonym of Marilyn Livingstone and Morgen Witzel, a collaborative Anglo-Canadian husband-and-wife team of writers and historians who live in Devon and do as much of their writing as possible on the beach or on the moors. Betwen them they have written more than twenty non-fiction and academic titles, with specialisms including management, medieval economic history and medieval warfare. Read More Read Less