James E. Sherow is a professor of history at Kansas State University. A specialist in the environmental history of the American West, he is the author of The Grasslands of the United States: An Environmental History and Watering the Valley: Development along the High Plains Arkansas River, 1870–1950. He is also the editor of A Sense of the American West: An Environmental History Anthology (UNM Press).
John R. Charlton was for many years a photographer with the Kansas Geological Survey at the University of Kansas. He provided the rephotographs for Donald L. Baars’s The Canyon Revisited: A Rephotography of the Grand Canyon, 1923/1991.