Simon claims he was sterilized himself at Auschwitz from repeatedly being injected with chemicals that he was told were vitamin supplements.
The Nazis told him "These shots will give you muscles to work. Do you understand that, you redheaded dog?"
He said the sterilization shots "caused his genitalia to swell and bleed and caused wrenching pain for days."
Before being taken to a concentration camp, Simon escaped the ghetto in his native Poland and slept in a cemetery next to an aunt's grave for several months.
At Auschwitz, Simon says he was spared from the gas chamber "because the Nazi doctors thought he had unusual genes" and "were trying to figure out why this Jew got red hair."
Of Mengele, he says "sometimes he gave people a piece of chocolate, and the next minute he shoots them in the head."
Simon says he personally saw a hunchback who's hump had been cut off by Dr. Mengele, and that Mengele threw a man into a bath of ice and let him freeze to death.
He also says he saw Nazi doctors administer X-rays to the genitalia of Gypsies in order to prevent them from reproducing.
Rozenkier claims he lost his mother, father, four sisters, and a brother in the Holocaust.
Simon Rozenkier, third from left in a dark cap, on the day the Buchenwald concentration camp was liberated in 1945. 
Article #1: The New York Times: "Survivor of Nazi Experiments Says $8,000 Isn’t Enough"
More on Simon, from his obituary:
Article #2: "Simon Rozenkier, 83: Holocaust survivor believed in people"
Note: use http://www.archive.org/ to find articles if original links no longer work