'Mad Men' star Rich Sommer chats about his role on 'The Office'

Everyone knows that The Office had a phenomenal main cast, but never forget that the series featured a number of truly impressive guest stars as well.

One of those guest stars was Rich Sommer, who played Pam's art school friend, Alex, in two Season 5 episodes of the show. You may know Sommer as Harry Crane on Mad Men, too. And...