David Keller is senior project archeologist at the Center for Big Bend Studies of Sul Ross State University where he has supervised archeological surveys of over 35,000 acres in Big Bend National Park, Big Bend Ranch State Park, the Davis Mountains Preserve, and private and state lands across the greater Big Bend. He was principal investigator of the Porvenir Massacre archeological project that revised the long-standing narrative of that event. He is also the author of numerous archeological reports as well as three books on regional history: Below the Escondido Rim: A History of the O2 Ranch in the Texas Big Bend, Alpine: Images of America, and In the Shadow of the Chinatis: A History of Pinto Canyon in the Big Bend. He is presently working on a new book on 1920s Big Bend photographer Frank Duncan.