The Legal Theory Bookworm recommends Naturalizing Jurisprudence: Essays on American Legal Realism and Naturalism in Legal Philosophy by Brian Leiter. Here is a description:
Brian Leiter is widely recognized as the leading philosophical interpreter of the jurisprudence of American Legal Realism, as well as the most influential proponent of the relevance of the naturalistic turn in philosophy to the problems of legal philosophy. This volume collects newly revised versions of ten of his best-known essays, which set out his re-interpretation of the Legal Realists as prescient philosophical naturalists; critically engage with jurisprudential responses to Legal Realism, from legal positivism to Critical Legal Studies; connect the Realist program to the methodology debate in contemporary jurisprudence; and explore the general implications of a naturalistic world view for problems about the objectivity of law and morality. Leiter has supplied a lengthy new introductory essay, as well as postscripts to several of the essays, in which he responds to challenges to his interpretive and philosophical claims by academic lawyers and philosophers. This volume will be essential reading for anyone interested in jurisprudence, as well as for philosophers concerned with the consequences of naturalism in moral and legal philosophy.
And a blurb:
This book will confirm Brian Leiter ‘s place in the front rank of legal theorists in the world today. Leiter is not just someone who writes well about what others have said. He has carved out a new path in legal theory, and set new standards for critical analysis and insight along the way."–Jeremy Horder, Law Commissioner for England and Wales and Professor of Criminal Law, Oxford University
This book collects Leiter’s important essays on American legal realism, naturalizing legal philosophy, and on moral philosophy. There are two new pieces: a postcript on "Interpreting Legal Realism" and one entitled "Science and Methodology in Legal Theory."
Many readers of LTB will be familiar with Leiter’s work, but if you are not and you are interested in contemporary analytic jurisprudence (Hart, Raz, Dworkin, etc.), then you really will want to explore Leiter’s arguments about the implications of Quine for the method of contemporary jurisprudence.