here's a good reference for starting to know the relationship better - and Joe is a great writer also. He's presenting his column as one might start out learning poker. Well, not exactly, he's got a pretty good coach...
Actually, though... sorry... I thought there was a reference to why he is nick'd Bear. I know I read it somewhere but I can't seem to find it! Perhaps one of the other Sebok articles has something?
Joe Sebok's Cardplayer Magazine Column