Philip Coppens was involved with André Douzet of Société Perillos. Coppens was the President of the English branch of Société Perillos, co-Founder of Frontier Magazine, Frontier Sciences Foundation, Frontier Bookshop and Frontier Publishing

Philip Coppens
-The Stone Puzzle of Rosslyn Chapel: The Truth Behind Its Templar and Masonic Secrets (Frontier Publishing, 2002; Completely Revised Edition, Adventures Unlimited Press 2004)

André Douzet; Philip Coppens
-The Secret Vault: The Secret Societies’ Manipulation of Saunière and The Secret Sanctuary of Notre-Dame-de-Marceille (Adventures Unlimited Press, 2006)

Philip Coppens
-The Cryptogram of Rennes-le-Chateau: A Guide To An Enigmatic Village (BookBaby, eBook, 2012)