Mark Metcalf gained his first big success as Neidermayer in Animal House. He reprised that persona in 2 Twisted Sister videos.
In more career symmetry, Metcalf played 'The Maestro' on Seinfeld and 'The Master' on Buffy the Vampire Slayer. I don't know if his real name on Buffy was also Bob Cobb, though.
When I met Metcalf at the Hollywood Collectors Show, I asked him which of his 8x10's he liked. As he pointed to one, a child (his son Julius?) sitting with him mockingly asked me why I didn't ask for his opinion. He pointed to another and said I should get both. Now that is a pretty good salesman!