raising the very same issues which the authority is there to settle". This, in turn, supports Raz's argument for legal positivismin particular "the sources thesis", "the idea that an adequate test for the existence and content of law must be based only on social facts, and not on moral arguments". Influence Raz was acknowledged by his contemporaries as being one of the most important legal philosophers of his generation. He authored and edited twelve books, namely The Concept of a Legal System (1970), Practical Reason and Norms (1975), The Authority of Law (1979), The Morality of Freedom (1986), Authority (1990), Ethics in the Public Domain (1994), Engaging Reason (1999), Value, Respect and Attachment (2001), The Practice of Value (2003), Between Authority and Interpretation (2009), From Normativity to Responsibility (2011) and The Roots of Normativity (2022). His most recent work deals less with legal theory and more with political philosophy and practical reasoning. In moral theory, Raz defended value pluralism and the idea that various values are incommensurable. Raz's work has been cited by the Supreme Court of Canada in such cases as British Columbia v Imperial Tobacco Canada Ltd and Sauvé v Canada (Chief Electoral Officer). Several of Raz's students became legal and moral philosophers, including two current professors in jurisprudence at Oxford, Leslie Green and Timothy Endicott, and the former professor of jurisprudence John Gardner. Honors and awards Raz was elected a fellow of the British Academy in 1987 and of the American Academy of Arts & Sciences in 1992. He was awarded honorary doctorates by the Catholic University of Brussels, 1993, by King's College London, 2009, and by Hebrew University, 2014. In 2005 he received the International Prize for Legal Research 'Hector Fix-Zamudio' from the National Autonomous University of Mexico, and in 2009 a Vice-Presidency Award from the Law Society of University College Dublin. In 2018 he received the Tang Prize in Rule of Law from Taiwan. In 2000–2001, he gave the Tanner Lectures on Human Values on "The Practice of Value" at the University of California, Berkeley. Books See also Philosophy of law Notes References Including a response by Raz. Lukas H. Meyer et al. (eds.), Rights, Culture and the Law: Themes from the Legal and Political Philosophy of Joseph Raz, Oxford: Oxford University Press, 2003. R. Jay Wallace et al. (eds.), Reason and Value: Themes from the Moral Philosophy of Joseph Raz, Oxford: Clarendon Press, 2004.