Charles van Riper III is a professor in the School of Natural and Renewable Resources and the Environment at the University of Arizona and the Station Leader for the US Geological Survey Sonoran Desert Research Station. He is the co-editor of all ten Colorado Plateau volumes. Miguel L. Villarreal is a Mendenhall Fellow and Research Geographer with the US Geological Survey Western Geographic Science Center in Tucson, Arizona. Carena J. van Riper is a PhD student in the Department of Recreation, Park and Tourism Sciences at Texas A&M University. Matthew J. Johnson is the Northern Arizona University station liaison for the USGS Colorado Plateau Research Station in Flagstaff, Arizona.