C. S. (Clive Staples) Lewis (1898-1963), one of the great writers of the twentieth century, also continues to be one of our most influential Christian thinkers. A Fellow and tutor at Oxford until 1954, he spent the rest of his career as Chair of Medieval and Renaissance English at Cambridge. He wrote more than thirty books, both popular and scholarly, inlcuding The Chronicles of Narnia series, The Screwtape Letters, The Four Loves, Mere Christianity and Surprised by Joy.