Video: Actor John Cullum talks about working with George Clooney

When John Cullum was performing on TV's Northern Exposure and ER, he got to know both these actors who've both gone on to do many other projects.

Em wants to know what makes them different. George Clooney, after ER. no matter what role he has played, he's always George C. Anthony Edwards played the Boy in the Bubble in Northern Exposure, and the lead doctor in ER, Dr. Green with John playing Dr. Green's father.)

Why has George C become a major star, and Tony, no longer the celeb he was in his ER days.. Actor John Cullum deliberately does not keep track of things like that, but Em thinks it's because George is himself, and Tony becomes another person, with each role.