Dr. Larry Stevens is the Curator of Ecology and Conservation at the Museum of Northern Arizona in Flagstaff. He is an evolutionary ecologist and a leading authority on the biology of the Grand Canyon region. He formerly served as the Park Ecologist for Grand Canyon National Park, and in addition to his curatorial post he presently also serves as Senior Ecologist for Grand Canyon Wildlands Council, Inc., a non-governmental conservation organization. Stevens has worked on a wide array of scientific topics over his career, including biogeography, regulated river ecology, endangered species biology, and most recently the ecology and stewardship of springs. He has authored or coauthored several books and numerous scientific and popular articles on topics, recently ranging from robberfly taxonomy, waterbug biogeography, peregrine falcon foraging behavior, river and dam management, springs ecosystem ecology, and whitewater river running. His primary scientific interests focus on assemblage responses to landscape development and environmental change over time.