At which two universities did C.S. Lewis hold academic positions?

C.S. Lewis held academic positions at Oxford and Cambridge.

Lewis taught at the University of Oxford for most of his academic career. He became a fellow and tutor in English at Magdalen College, Oxford, in 1925 and remained there until 1954. His Oxford years included the period when he wrote many of his major literary and apologetic works.

In 1954, Lewis became the first holder of the newly established Chair of Medieval and Renaissance Literature at Magdalene College, Cambridge. He continued teaching and writing there until his death in 1963, while retaining connections with Oxford.

The universities are sometimes confused with the colleges where Lewis worked. Magdalen College belongs to Oxford, whereas Magdalene College, Cambridge, is a separate institution. The similar names are an especially common source of errors in short biographies of Lewis.