G. Farben also had a significant investment in a company that made Zyklon B gas, which was used to kill hundreds of thousands of Jews at Auschwitz the concentration camp in Poland where Wiesel's mother and sister died. Last Wednesday's lecture, at which Wehmeier introduced Nobel Prize-winning Wiesel, almost didn't happen. Wiesel found out months ago that Bayer was a sponsor of the Three Rivers Lecture Series in Pittsburgh, and he canceled his appearance. When the director of the series, Dennis Ciccone, told Wehmeier that Wiesel declined to attend because Bayer was a sponsor, Wehmeier visited Wiesel at his New York apartment. "I was very moved by the man," Wiesel told the Pittsburgh Post-Gazette. "I explained to him the situation. And I said to him, 'Look, Bayer never apologized.