Alvin Plantinga is the contemporary world's most influential Christian philosopher. His work over the past six decades has paved the way for Christian thinkers in the fields of philosophy of religion, epistemology, metaphysics, and science. Despite the widespread rejection of Christian assumptions by the majority of modern thinkers, Plantinga is unembarrassed to use them in his academic work and defends them well. Throughout his career, Plantinga has addressed important philosophical questions that have been debated for millennia. In this accessible overview and analysis of his work, philosophy professor Greg Welty examines his approach to faith and reason, the problem of evil, theistic arguments, the divine attributes, religion and science, and Christian philosophical method. He concludes by studying Plantinga's body of work and its interaction with his Reformed heritage. Welty combines philosophical accuracy with theological evaluation as he encourages readers to do their own thinking on these critical subjects.