In this paper, I argue that dialogue between legal philosophers and social scientists can be mutually beneficial. Nicola Lacey offers a vision of jurisprudence that supposes as much. I start by setting out my interpretation of her view. I then defend its potential, which she takes for granted, from the challenges posed by, first, an apparent friend—Brian Leiter—and, second, obvious adversaries—Joseph Raz and others. My response proposes an alternative to their conceptions of legal philosophy, one that is consistent with my (...) understanding of the approach to jurisprudence that Lacey recommends. (shrink)