Which university employed C.S. Lewis as a professor from 1954?

Cambridge University employed C.S. Lewis as a professor from 1954. He became the first holder of the newly established chair of Medieval and Renaissance English at Magdalene College, Cambridge, and held the post until his death in 1963.

Before moving to Cambridge, Lewis had spent most of his academic career at Oxford. He was a fellow and tutor in English at Magdalen College, Oxford, from 1925 to 1954. The move did not sever his Oxford connections: he continued to live near Oxford and remained associated with the literary and academic life of the city.

The two institutions are easy to confuse because Lewis taught at both. Oxford was the setting of his long earlier career, while Cambridge was the university that appointed him to a professorship. Cambridge University is the precise answer; Magdalene College is the specific Cambridge college where he held the chair.