Michael P. Ghiglieri earned his Ph.D. in Ecology from UC Davis for his pioneering research on wild chimpanzees. In addition to teaching university courses in primate behavior, human evolution and ecology, he has worked as a wilderness river guide and EMT running more than 670 commercial whitewater trips including over 150 through Grand Canyon. His books include, "The Chimpanzees of Kibale Forest," "East of the Mountains of the Moon," "Canyon," "Over the Edge: Death in Grand Canyon," "First through Grand Canyon" and "Off the Wall: Death in Yosemite."