Tim's first book, "The Mark of the Beast", was written in collaboration with Trevor Ravenscroft. He is the author of "An Illustrated Guidebook to Rosslyn Chapel" (1993) and "The Templar Legacy and The Masonic Inheritance Within Rosslyn Chapel" (1994), both published by The Friends of Rosslyn. A popular and fluent speaker, he lectures on Freemasonry and the Knights Templar.
Marilyn Hopkins has spent over ten years studying various forms of Christianity and esoteric spirituality. She is co-founder with Tim of the European Templar Heritage Research network and co-author of Rosslyn.