Don Christensen has spent 35 years in public education in Orange County, California, at the high school, community college, and university levels teaching history, political science, anthropology, and coaching men and women's cross country and track and field before retiring. He has 37 years of experience doing archaeological survey, excavation, and rock art recording for a number of cultural resource management companies in California and for the Bureau of Land Management, the United States Forest Service, and the National Park Service in Arizona, California, Nevada, and Utah. Specifically he has 22 years of experience working on projects for the Grand Canyon National Park, Grand Canyon-Parashant National Monument, Grand Staircase-Escalante National Monument, BLM/Arizona Strip, and the Kaibab National Forest. He has published numerous articles in journals and authored technical reports for federal resource agencies.  

Jerry Dickey is a retired judicial assistant in the Superior Court of Los Angeles County, California. He did his academic fieldwork on prehistoric Archaic sites and a historic Spanish presidio in Southern California. He has documented rock art for the Grand Canyon National Park, Grand Canyon-Parashant National Monument, BLM/Arizona Strip, and the Kaibab National Forest since 1992. He has recorded rock art in the California desert for the last 25 years.

Steven M. Freers is a secondary chemistry teacher in Riverside County, California, and teaches Native American Rock Art courses for The University of California, Riverside. For the past 25 years he has been involved in rock art research and conservation in Riverside and San Diego Counties and has worked closely with Luise, Cahuilla, and Kumeyaay tribal societies. In 1994, he co-authored a book on southern California rock art "Fading Images," and served five years as the senior editor for the American Rock Art Research Association. His specialty is the use ofanthropometric data to project the stature and gender of the makers of prehistoric hand impressions. The past 14 years have found Steve assisting his two co-authors recording rock art in the Grand Canyon National Park, BLM/Arizona Strip, and the Kaibab National Forest.