This book describes the links between Jewish genetics, history, diversity, and identity. With a unique blend of expertise and enthusiasm, it takes readers on a quest to reveal the answer to "Who is a Jew?"Exploring the Jewish diaspora, this book takes a journey across the globe. From Assyria, Babylon, and the Greco-Roman world of ancient history to the Sephardim and Ashkenazim of today, it investigates the breadth and depth of the Jewish gene pool. Modern genetic research meets old beliefs about ethnicity and religion as the book sheds new light on old debates.