> examines John Henry Newman's understanding of history and doctrine in his own context, first as an Oxford student and professor reading Edward Gibbon and influenced by his close friend Hurrell Froude, then as a new Catholic convert in dialogue with his brother Francis, and finally as an eminent Catholic during the controversies over the dogmas of the Immaculate Conception (in dialogue with Edward Pusey) and papal infallibility (in dialogue with Ignaz von Döllinger). Author Matthew Levering argues that Newman's career is shaped in large part by concerns about doctrinal corruption. Newman's understanding of doctrinal development can only be understood when we come to share his concerns about the danger of doctrinal corruption--concerns that explain why Newman vigorously opposed religious liberalism. Particularly significant is Newman's debate with the great German Church historian Döllinger since, in this final debate, Newman brings to bear all that he has learned about the nature of history, the formation of Church doctrine, the problem with private judgment, and the role of historical research.