Colin Duriez is author of a number of books on C. S. Lewis, J. R. R. Tolkien and the Inklings, including A Field Guide to Narnia, The C. S. Lewis Encyclopedia, The C. S. Lewis Chronicles, The Inklings Handbook (with David Porter), Tolkien and C. S. Lewis: The Gift of Friendship and Tolkien and The Lord of the Rings. He has lectured on Lewis and Tolkien in many countries, and has appeared as a commentator on BBC television and on extended-version DVDs of Peter Jackson’s The Lord of the Rings and the PBS series “The Question of God,” on Lewis and Freud.