He lectured in philosophy for a year before he was elected a fellow in English at Magdalen College, Oxford in 1925. Lewis taught there until 1954, when he was appointed professor of Medieval and Renaissance studies at Cambridge University. He mastered ancient, medieval, renaissance and reformation philosophy and literature. For example, his highly regarded book English Literature in the Sixteenth Century took him sixteen years to write because he felt he had to read everything in English in the sixteenth century before he wrote the book. This was typical of his thoroughness.Emphasis added.
From C. S. Lewis's Case for Christ by Art Lindsley.
InterVarsity Press, ISBN 0-8308-3285-8
