David W Gooding, MA, PhD, professor emeritus of Old Testament Greek at Queen's University Belfast, is a member of the Royal Irish Academy. Professor Gooding travels extensively, giving lectures and, besides academic works, is the author of expository books on Luke, John 13-17, Acts and Hebrews.

John C Lennox, MA, DPhil, PhD, DSc, is Professor of Mathematics at University of Oxford, and Fellow in Mathematics and Philosophy of Science, Green Templeton College, University of Oxford. He is the author of many academic works in his research field of pure mathematics, and travels extensively to lecture on mathematics and apologetics.