This book reports on the lives and works of the most influential Catholic theologians of the twentieth century. This is a new book from one of the foremost Roman Catholic theologians currently writing in English. It reports on the lives and works of the most influential Catholic theologians of the twentieth century. This work covers theologians including: Chenu, the guru of the French worker priest movement; Congar who was imprisoned in Colditz; and, Kung who was banned from teaching for decades because of his radical views. This work highlights the involvement of each theologian with the Second Vatican Council, and the dissatisfaction of most with what was achieved. It includes a chapter on the controversial prelate, Pope John Paul II.