If the devil didn't teach Robert Johnson, it was this man (and it's a straight shot from Johnson to Chuck). He taught Muddy, too. In fact, there's a great paragraph in the Muddy Waters biography "Can't Be Satisfied" where Muddy Waters spots a band member imitating the aged limp of Son House. Waters puts a stop to it immediately and tells the band to give some respect to a man who was there before all of them.
We've got to do the same. If you don't know him, here's a place to start.
He even looks a little like Chuck Berry in the shot up there.