Author information: Pete McBride has traveled on assignment to more than 75 countries for the National Geographic Society, Smithsonian, Outside, Esquire, Microsoft, and The Nature Conservancy. Recently, McBride has focused his cameras on his backyard river, the Colorado. Four years and 1,500 river miles later, McBride produced a book, filmed three award-winning short documentaries, and hosted a PBS TV program. Kevin Fedarko lives in northern New Mexico and works as a part-time river guide in Grand Canyon National Park. He is the author of the New York Times bestseller The Emerald Mile. In addition to his travel narratives in Outside, where he worked as a senior editor, Fedarko's work has appeared in Esquire, National Geographic Adventure, and other magazines. Hampton Sides is editor-at-large for Outside magazine and the author of the international bestseller Ghost Soldiers.