That would have to be a toss-up between Bryan Peterson for his ability to make photographic art out of anything.. and Scott Kelby for his ability to shoot awesome portraits.
I'll have to nominate Clyde Butcher here in Florida... His works (B/W) are outstanding ranks right up there with the best in the field............ Go to: http://www.clydebutcher.com/
I do like Gibson, but he was a feather weight compared to. Helmut Newton. Liked Newton's sophisticated story telling. He made it look easy. That whole death thing has diminished his work.