If you look at the images of him in the Bio section, you'll notice he's not exactly running around with a T2i (or even a 1DsMkIII)
Medium Format film, Wide (Pano) Format cameras, judicious use of filters and capturing the image when conditions are optimal. There really isn't any black magic to it. Bust your behind to perfect your craft and shoot when conditions help rather than hinder. His Antelope Canyon shots are a perfect example of knowing exactly when to be somewhere because you only get those kinds of light shafts at a specific time of day for a specific part of each year. If you visit earlier or later in the year, the sun doesn't get high enough to penetrate the "crack" over your head (as I found out when I went in September of 2006.)
IIRC, his gallery images show so well because of the quality of the printing and the paper used (Fuji Crystal something...) Some claim they use polarized light in the galleries but people have reported seeing his work in private homes with no special lights and it still has the same "pop."
He's simply very, very good at what he does and he also has a helluva marketing machine as well. 