Thierry Meyssan () is a French journalist, conspiracy theorist and political activist. He is the author of investigations into the extreme right-wing, particularly France's National Front militias, as well as into the Catholic church. Meyssan's book 9/11: The Big Lie (L'Effroyable imposture) challenges the official account of events of the September 11 terrorist attacks. Career Meyssan is president of the Voltaire Network, which had been a respected independent think tank prior to the publication of 9/11: The Big Lie. His reputation helped raise his conspiracy theory to prominence. Meyssan has been noted as using cross-citations of other conspiracy theorists' works in order to lend the appearance of credibility to his ideas. Regarding the events of 9/11, Meyssan cited Webster Tarpley; Tarpley cited David Ray Griffin; and Griffin cited Meyssan. Publication of The Big Lie In 2002, he published a book on the September 11 terrorist attacks, with the English translation titled 9/11: The Big Lie. Meyssan argued that the attacks were organized by a faction of the US military–industrial complex in order to impose a non-democratic regime in the United States and to extend US imperialism. It is one of "the first wave of book-length conspiracy speculations" in France and Germany about 9/11. A follow up to his first book titled L’effroyable Imposture II (The Big Lie 2) accused Israel of carrying out the assassination of Rafic Hariri. Response French media quickly dismissed the contents of the book, and a Pentagon spokesperson also deprecated the book. In 2005, the U.S. State Department declared Meyssan a persona non grata due to his active promotion of misinformation about the United States. Works La Protection des homosexuels dans le droit européen de Collectif, Projet Ornicar éd. (Paris), 1993, . L'Intégration des transsexuels de Collectif, Projet Ornicar éd. (Paris), 1993, . Charles Millon, le porte-glaive de Collectif, Golias (Lyon), 1999, . L'Énigme Pasqua, Golias (Lyon), 2000, . Terrorisme en soutane : Jean-Paul II contre l'IVG par le Réseau Voltaire pour la liberté d'expression, L'Esprit frappeur (Paris), 2000, . 9/11 The Big Lie, Carnot Publishing (London), 2002, . Pentagate, USA Books (New York), 2002, . Os Senhores da Guerra, Frenesi (Lisboa), 2002, . Foreword (with Jean Ziegler), Le Cartel Bush, Timéli (Genève), 2004, . Politicamente Incorrecto, postface by Fidel Castro, Ciencias sociales (Cuba), 2004, . Foreword (with José Saramago), El Neron del siglo XXI, Apostrofe (Madrid), 2004, . L'Effroyable imposture 1 & Le Pentagate, Nouvelle