In “The Formation of the Book of Isaiah: Foundations and Current Issues,” Marvin A. Sweeney analyzes the history of scholarship about the editorial processes that gave rise to the Hebrew text as we have it. As scholars have long done, he takes Bernhard Duhm’s nineteenth-century commentary as a starting point, but then shows the myriad ways in which more recent scholars have challenged his presuppositions and greatly improved on his findings. In the process, he identifies many of the themes and features in the book that have led him and other interpreters to perceive a redactional shaping of the book in four major phases—broadly one per century in the eighth through fifth centuries bce. Sweeney’s most significant contributions to the study of Isaiah, reflected here, have been his demonstration of the Davidic covenant in the final form of the book and his refinement of our understanding of the Josianic layer from the late seventh century bce.