On November 10, 1991 in Weinheim, Germany, Fred A Leuchter made a presentation to a group of German right wing extremists. The meeting was chaired by Günter Deckert who acted as Mr. Leuchter’s interpreter, 1 and infrequently added comments of his own.
Harry W, Mazal, OBE has written an essay whose purpose is "to address the many inconsistencies, misinterpretations, and mendacious statements made by Mr. Leuchter."
The essay can be found at The Holocaust History Project website at: http://www.holocaust-history.org/auschwitz/leuchter-speech/leuchter-speech.shtml.