Molly Worthen is a historian at the University of North Carolina at Chapel Hill who writes frequently about America’s religious culture.

Matthew Sutton is a professor at Washington State University. He teaches courses on religious history and wrote American Apocalypse: A History of Modern Evangelicalism.

David Nirenberg is a professor of history at the University of Chicago, where he specializes in medieval Christians, Jews and Muslims. Much of his work has focused on anti-Semitism.

Thomas Kaufmann is a professor of church history at the University of Göttingen in Göttingen, Germany. He is chairman of the Association for the History of the Reformation and is the author of multiple books and articles about the Reformation.

Carl R. Trueman is a professor of church history at Westminster Theological Seminary in Glenside, Pa. He teaches a course on the Reformation, which is available online, and is the author of  The Reformation: Yesterday, Today and Tomorrow. Contact via the seminary’s main telephone number or an online email form.

Lyndal Roper is a professor of history at Oriel College at Oxford University in Oxford, England. She is an expert on German religious history, especially Martin Luther and the Protestant Reformation, and the history of witchcraft. She is the author of Martin Luther: Renegade and Prophet.

John Grim is a senior lecturer and senior research scholar at the Yale School of Forestry and Environmental Studies at Yale University in New Haven, Conn. Grim earned his doctorate in the history of religions and is a co-author of Ecology and Religion.