John S. Haller is a professor of history at Southern Illinois University Carbondale. He is the author of numerous books, including Medical Protestants: The Eclectics in American Medicine, 1825–1939, Farmcarts to Fords: A History of the Military Ambulance, 1790–1925, and The People’s Doctors: Samuel Thomson and the American Botanical Movement, 1790–1860. Barbara Mason is the curator of the Pearson Museum at the Southern Illinois University School of Medicine in Springfield, Illinois, where she is also a member of the Department of Medical Humanities. She is the coauthor, with Emmet F. Pearson, of My Sixty Years of Medicine and The Emmet F. Pearson Collection of Disinfected Mail and, with John S. Haller, of Forging a Medical Practice, 1884–1938: An Illinois Case Study.