After 2 years, we catch up with our past Photography Person of the Year award-winner, Louie Psihoyos, to see how his career has progressed.

Following his Oscar-winning success with the crusading documentary "The Cove" in 2009, about the brutal dolphin harvesting practices in Japan, Louie Psihoyos is following up with another documentary that he says will be an "eco-thriller."

As head of the nonprofit environmental group the Oceanic Preservation Society, Psihoyos says he spends far more time directing films behind a video camera than he used to behind a still camera. When he does take still images, however, it's usually underwater. "My friend who set me up with the nonprofit, Jim Clark [founder of Silicon Graphics, Netscape, WebMD and Shutterfly] built for us the best underwater camera in the world."

When his next movie comes out, sometime in 2014, Psihoyos says the film release will be accompanied by a traveling exhibit of the work created with the specially designed camera, which has been called the "holy grail" of underwater cameras by famed diver David Doubillet. "We're primarily shooting the last of some of the best-preserved reefs in the world, as a document to the bio-diversity we'll have lost in the next few decades," Psihoyos says. "Ocean habitat is disappearing at an incredible rate through multiple insults, overexploitation, reef bleaching, pollution and ocean acidification to name a few."

Psihoyos says he hopes that the film, the exhibit and a related educational campaign can inspire large-scale societal change. "It's asking a lot of the medium," he adds, "but I've come to think of film as the ultimate weapon of mass construction."