This excellent book introduces the reader to one of the twentieth century’s most important Orthodox thinkers, whose writings on ecclesiology, Christology, and Trinitarian theology are set forth here with great skill. Especially enlightening is the author’s analysis of Dumitru Staniloae’s views on the filioque, how they developed, and how they impacted his evolving understanding of the church. Still largely unknown in the English-speaking world, Staniloae’s theology finally gets the attention it deserves in Viorel Coman’s first-rate treatment.