Brother of Elmar Wepper
His character "Harry Klein", the assistant in "Derrick" (1974), became a cult figure all over the world. Many Japanese believed that every German has his own "Harry".
The producer of Max and the Junkmen (1971) didn't allow him to participate at the Academy Awards ceremony in 1973.
The producers of Cabaret (1972) didn't allow him to participate at the Academy Awards ceremony in 1973.