Emeritus Fellow, All Souls College, Oxford (siden 2004) Senior Research Fellow, All Souls College, Oxford (1991–2004). Professor i gresk, University of London (kollegiene Bedford College, senere Royal Holloway og Bedford New College) (1974–1991). Fellow og i klassikerne, University College, Oxford (1963–1974). Jr. Woodhouse Research Fellow, St. John's College, Oxford (1960–1963).