The scholarly enterprise is notable for the variety of forms it takes. Interdisciplinarity, one of these forms, is a hallmark of Societal Agents in Law. Specifically, the book draws on three fields and my background in each: Its subject matter and style result from my training in law and from my long experience as a law school professor; its theory comes from my schooling in sociology; and its quantitative evidence is built on my work in demography. Hopefully, the book has blended the foregoing fields in an effective manner and improves our understanding of what it is about, namely, the societal determinants of the content of law. Especially in modern nations, these determinants merit attention. Social development has gone the farthest in modern nations and is associated with a larger volume of law.1 As social development proceeds and doctrines of law become more frequent, the doctrines will be more varied in content. Quite correctly, then, those of us who reside in a modern society sense that law is omnipresent and complex.