 He was a literary and social critic, historian, playwright, novelist, Catholic theologian and apologist, debater, and mystery writer.He was a columnist for the "Daily News", "The Illustrated London News", and his own paper, "G. K.'s Weekly"; he also wrote articles for the "Encyclopædia Britannica", including the entry on Charles Dickens and part of the entry on Humour in the 14th edition (1929).His best-known character is the priest-detective Father Brown, who appeared only in short stories, while "The Man Who Was Thursday" is arguably his best-known novel.