Tim Wallace-Murphy (1930-2019) studied medicine at University College, Dublin, and then qualified as a psychologist; he later became an author, lecturer, and historian. He has written more than a dozen books, including The Mark of the Beast (with Trevor Ravenscroft), Rex Deus, and Rosslyn: Guardian of the Secrets of the Holy Grail. This last book provided invaluable source material to Dan Brown for his bestselling novel The Da Vinci Code.

James Martin is a British historian, economist, and lecturer. James has previously worked in finance and employment law, and is presently a lecturer in further and higher education. He has dedicated a large portion of his more recent life to research into the Knights Templar, the Roman Empire, and the Western traditions of spirituality.