Matt Siber - http://siberart.com/ - from his series The Untitled Project. Interesting work dealing with public advertising. Basically photographs a public space, removes all the signage, and displays them side-by-side.
Robert Polidori - he does not have a personal website, but I have listed some that will provide some visuals. He has several books that are very interesting. Edwynn Houk Gallery - Nicholas Metivier Gallery - Steidl books - the links provided displays work that examines the Chernobyl dead zones.
Mitch Epstein - http://www.mitchepstein.net/ - http://whatisamericanpower.com/ - from his American Power series. This plays of the Amish aspect of the last lecture and how we decide what technology we accept and how it contributes to our community and society.