 The publication of Arthur Butz's The Hoax of the Twentieth Century: The case against the presumed extermination of European Jewry in 1976; and David Irving's Hitler's War in 1977 brought other similarly inclined individuals into the fold. Butz was a tenured associate professor of electrical engineering at Northwestern University. In December 1978 and January 1979, Robert Faurisson, a French professor of literature at the University of Lyon, wrote two letters to Le Monde claiming that the gas chambers used by the Nazis to exterminate the Jews did not exist. A colleague of Faurisson, Jean-Claude Pressac, who initially shared Faurisson's views, later became convinced of the Holocaust's evidence while investigating documents at Auschwitz in 1979. He published his conclusions along with much of the underlying evidence in his 1989 book, Auschwitz: Technique and operation of the gas chambers.
