Karl Barth (1886-1968) was Professor of Theology at the University of Basel, Switzerland. One of the greatest theologians and preachers of the twentieth century, he is best known for his monumental systematic theology, Church Dogmatics.
William Klempa is Principal Emeritus of the Presbyterian College, Montreal, and Adjunct Professor in McGill University's Faculty of Religious Studies. In 1998, he served as Moderator of the Presbyterian Church in Canada. He is the author or editor of several works, including Exploring the Faith: Essays in the History and Theology of the Reformed Tradition.