Acclaimed as one of the most influential contemporary Christian thinkers, Hans Kung is considered a "modern-day Luther" because of his struggle to reform the Roman Catholic Church, especially in seeking to overturn the doctrine of the infallibility of the pope and bishops. In this masterful profile, John J. Kiwiet sheds light on Kung's life, his significance as a shaper of modern theology, and his call to prioritize Scripture and the Jesus of history.