Legal positivism is a school of thought of philosophy of law and jurisprudence, largely developed by eighteenth and nineteenth-century legal thinkers such as Jeremy Bentham and John Austin. However, the most prominent figure in the history of legal positivism is H. L. A. Hart, whose work The Concept of Law caused a fundamental re-thinking of the positivist doctrine and its relationship with the other principal theories of law. In more recent years the central claims of legal positivism have come under attack from Ronald Dworkin.