An eminent scholar of the history of Judaism, Jacob Neusner shows how Judaism changed from a philosophy to a religion between 200 and 400 C.E. The Transformation of Judaism is a work both revolutionary in its method and unprecedented in its results. Comparing earlier and later sets of Judaic writings, Neusner sets forth how philosophy—abstract, elegant, orderly, and intellectual—turned into religion—tangible, down-to-earth, chaotic, and concrete. In the process, he offers an account of the birth of Judaism that has become normative. Moreover, Neusner’s methodology can be applied to the study of religions other than Judaism because it examines the underpinnings of how a society sees the world (philosophy), orders itself (politics), and sustains itself (economics).