Clive Staples Lewis was a celebrated British writer and scholar who is known for his works of fantasy and Christian apologetics. There are several synonyms that are used to refer to him including C.S. Lewis, Jack Lewis, and Clive Hamilton. The pen name, N.W. Clerk, is also attributed to him for some of his early works. Lewis is most famed for creating The Chronicles of Narnia series which has been adapted into several films. He also wrote numerous other books including The Screwtape Letters, Mere Christianity, and The Space Trilogy. Lewis's contributions to literature and Christian theology have earned him a place among the most significant Christian writers of the 20th century.