Who is Mengels? Can't find him on Google search? Are you confusing him with Mengele aka the angel of death? If so very doubtful (and never heard this before) he was Jewish given his position in the Nazi regime at the time.
yes my spelling mistake, sure i read he was a jew somewhere when checking before i wrote that? don't forget how far from the arian ideal Hitler was so anything is possible, I know he definitely had jews volunteer to help him in his research. There are of plenty of cases of Jews, i suppose trying to stay alive, by working for the Nazi's.