Leonard J. Swidler is Professor of Catholic Thought and Interreligious Dialogue at Temple University, Philadelphia, Pennsylvania, where he has taught since 1966. He is the co-founder and editor of the Journal of Ecumenical Studies (quarterly). He is also the founder/president of the Dialogue Institute, the senior advisor for iPub Global Connection a book publisher, and the founder and past president of the Association for the Rights of Catholics in the Church (1980–).

Rudolf Karl Bultmann was a German Lutheran theologian and professor of the New Testament at the University of Marburg. He was one of the major figures of early 20th-century biblical studies. A prominent critic of liberal theology, Bultmann instead argued for an existentialist interpretation of the New Testament. His hermeneutical approach to the New Testament led him to be a proponent of dialectical theology.