He is a researcher of the Institute for Philosophical Research of the National Autonomous University of Mexico (UNAM), Doctor of Law from the University of Alicante and Professor of Philosophy and Theory of Law graduate in law from UNAM. Collaborate with human rights organizations and the training of judges. He has recently been appointed director of the magazine Isonomía. Journal of Theory and Philosophy of Law. He is the author of the book The concept of rights (1999) and editor (with Miguel Carbonell and Rodolfo Vazquez) social rights and minority rights (2000).