Susan Flader is professor emerita of history at the University of Missouri-Columbia, where she has taught American and world environmental history and the history of the American West. She has published widely on the career and thought of Aldo Leopold, including Thinking Like a Mountain (1974/1994) and The River of the Mother of God (1991), as well as numerous other works of forest and environmental history. She has served as president of the American Society for Environmental History and currently chairs the board of the Aldo Leopold Foundation, and she has received numerous national and state awards for publications, service and conservation action.