Chairman Hahn = Mr.Hahn Mr.Hahn = Joe Hahn Joe Hahn = DJ for the band Linkin Park edit: Chairman in Korea is a high position (not sure), but I think it's like a president... All I know is that it's a high position of some sort...
Chairman is usually the big guy in a buisness, the big boss, and as said before it's one of Mr.Hahn's nicknames.
Since everyone in this thread is just repeating what I said in the beginning, and seeing this is answered, I'm closing this. I'm assuming everyone who is saying basically the exact same thing I said in my post is just upping their post count. Stop it. Closed.