Kenneth G. Appold is the James Hastings Nichols Professor of Reformation History at Princeton Theological Seminary and has written extensively on the history and theology of the Reformation and post-Reformation periods. He was formerly a professor at the Institute for Ecumenical Research in Strasbourg, France, and remains active in Lutheran ecumenical work. Nelson H. Minnich is Ordinary Professor of Church History at the Catholic University of America. He works primarily on early sixteenth-century conciliar and papal history. Between 1993 and 2019 he has published four books and edited or co-edited four others. Recipient of numerous fellowships and a member of the Pontifical Committee of Historical Sciences, he is the editor of the Catholic Historical Review since 2005.