Oberman's magisterial work transfers discussion of late medieval Christian thought from the private studies of the specialist to more general use and understanding, and explains the significance of the ideas of the time. Although this 'Late Medieval Reader' does not exhaust the riches of the period between the High Middle Ages and the Reformation era, it introduces the reader to aspects of such major themes as conciliarism, curialism, mysticism, scholasticism, the spirituality of the Devotio Moderna, and the impact of Renaissance humanism.The theme of the Forerunners has grown out of the consideration that the justified rejection of a confessional reading of the past has been succeeded by an equally unhistorical disjunction of the Medieval and Reformation periods. Without a grasp of the fourteenth and fifteenth centuries, the medieval basis of modern thought is incomplete, since Reformation and Counter Reformation seem to arise 'out of the blue'.
Heiko Augustinus Oberman was a Dutch historian and theologian who specialized in the study of the Reformation. After earning his doctorate in theology from the University of Utrecht in 1957, he taught at the Harvard Divinity School from 1958 until 1966 and then at the University of Tübingen, Germany from 1966 until 1988, when he became Regents Professor of History at the University of Arizona, Tucson.