Kenneth Mars (April 4, 1935 – February 12, 2011) was an American television, film and voice actor, who specialized in comedic roles. He may be best-remembered, albeit not by name, for his roles in two Mel Brooks films: as the insane Nazi playwright Franz Liebkind in The Producers (1968) and as the relentless Police Inspector Hans Wilhelm Fredrich Kemp in Young Frankenstein (1974).