He is currently exhibiting at FOMU (foto museum) in Antwerp, his first showing in Belgium.
His work depicts ordinary Americans in their natural surroundings, and often emphasizes the sheer scale of the North American landscape in his work.
I found Broken Leaves particularly interesting.
An excellent documentary is also showing alongside the Expo, in which he talks to some of his subjects about their lives. It is well worth seeing.
FOMU always has expos on each of its three floors; I have spent many an hour there and never once have I come away disappointed. This one I certainly recommend.