C. S. Lewis (1898–1963) and Louis MacNeice (1907–63) are two writers who were born and raised in Northern Ireland, but whose careers took them to England. C. S. Lewis was a poet, novelist, academic, medievalist, literary critic, essayist, lay theologian, and Christian apologist. Born in Belfast, he held academic positions at both Oxford University, and Cambridge University. He is best known both for his fictional work, especially "The Screwtape Letters" (1942), "The Chronicles of Narnia" (1949–54), and "The Space Trilogy" (1938–45), and for his non-fiction Christian apologetics, such as "Mere Christianity", "Miracles", and "The Problem of Pain". His faith had a profound effect on his work, and his wartime radio broadcasts on the subject of Christianity brought him wide acclaim.