David Yetman is distinguished outreach faculty and a research social scientist at the Southwest Center of the University of Arizona, where he has worked since 1992. His research specialties include the peoples and ecology of northwest Mexico and the southwestern United States. Yetman has a PhD in philosophy and is author of numerous books and articles, including Sonora: An Intimate Geography, Natural Landmarks of Arizona, and The Saguaro Cactus: A Natural History. Yetman is the former host of the PBS series The Desert Speaks and current host and co-producer of the PBS travel/adventure series, In the Americas with David Yetman.