Is Dworkin A Legal Positivist?

Is Dworkin A Legal Positivist? Dworkin is most famous for his critique of Hart’s legal positivism; he sets forth the fullest statement of his critique in his book Law’s Empire. Dworkin’s theory is “interpretive”: the law is whatever follows from a constructive interpretation of the institutional history of the legal system. Is Dworkin a positivist