Michael David Bailey is a historian of the European Middle Ages. Currently, he is Professor of History at Iowa State University. His research focuses on late medieval religious history, the history of magic, witchcraft, and superstition, as well as heresy and religious reform. He also studies the history of magic globally from antiquity to the present day. Bailey is the author of five books. His first book, "Battling Demons: Witchcraft, Heresy, and Reform in the Late Middle Ages," was published in 2003.