Thierry Meyssan (French: [tjɛʁi mɛsɑ̃]) is a French journalist, left-wing 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. Source: Wikipedia (en)