In 1985 Mattogno published the booklet The Gerstein Report – Anatomy of a Fraud and in 1988 the book The Myth of the Extermination of the Jews. Since the 1990s Mattogno has largely focused his publications on the Auschwitz-Birkenau camp.
Mattogno is a former member of the advisory board of the Institute for Historical Review and current editorial advisor for the journal printed by the Committee for Open Debate on the Holocaust, bodies which promote Holocaust denial. Mattogno also contributes to the French-language journal Annales d'histoire révisionniste.
Terry, Nick, Roberto Muehlenkamp, Jason Myers, and Jonathan Harrison (2012). Belzec, Sobibor, Treblika: Holocaust Denial and Operation Reinhard: A Critique of the Falsehoods of Mattagno, Graf, and Kues. Holocaust Controversies. Book Response to Mattogno's Writings.