1 Enoch presents interpreters with a complex knot of interrelated puzzles concerning the history of early Judaism, the trajectories of wisdom and apocalyptic traditions, and the role of astronomical observation in cosmological speculation-all tied up with the bewildering history of the book’s composition and transmission, in different languages and manuscript traditions, over centuries. Two of the world’s preeminent scholars offer masterful judgments on all of these questions out of the erudition gained over long and distinguished careers. The result is a remarkably lucid and accessible commentary that will be the definitive resource on 1 Enoch for decades.