Robert A. Birmingham served as the state archaeologist of Wisconsin for many years and taught Anthropology at the University of Wisconsin Waukesha, USA. His numerous books include Indian Mounds of Wisconsin (2017, with Amy L. Rosebrough); Spirits of Earth: The Effigy Mound Landscape of Madison and the Four Lakes (2009); and Aztalan: Mysteries of an Ancient Indian Town (2006, with Lynn G. Goldstein).