Joel Sartore has been a contributing photographer for National Geographic magazine since 1991. His articles have covered endangered species, America’s wildlife refuges, and U.S. federal lands, and include features on several states. His work has also appeared in Audubon, Life, Newsweek, Sports Illustrated, Time, and dozens of books. Sartore is a cofounder of the Grassland Foundation and the author of RARE: Portraits of America’s Endangered Species and Nebraska: Under a Big Red Sky (available in a Bison Books edition).