Louis Markos is a Christian apologist who is Professor in English and Scholar in Residence at Houston Baptist University. He specializes in cultural and literary apologetics, and is an expert on Christian writers like C.S. Lewis and J.R.R. Tolkien. 
He published a book entitled, On the Shoulders of Hobbits: The Road to Virtue with Tolkien and Lewis which is an apologetic book on the Christian teachings in J.R.R. Tolkien's fantasy stories in The Hobbit and The Lord of the Rings.