That is greg white. And he has been a comic dealer for half a century, using that same booth configuration and old school wood racks. He has done literally hundreds, maybe thousands, of shows, dealing in every big silver age key that there is.
He recently started dealing in graded books, but for most part just deals in raws. Note, the rack configuration he uses, he has 1 shelf of graded books, all the rest are raw, and that is the only 1 shelf on the entire rack that could fit a graded book height wise.