PHD in law, magna cum laude of the National Autonomous University of Mexico. He was member of the Government Board of this University. Researcher at the Legal Research Institute. Antique professor of the School of Laws. National researcher emeritus of the National Researches System (NSI). Honoris Causa Doctor by several national and foreign universities. He was judge of the Interamerican Court of Human Rights (1998-2009) and President of this court (2004–2008). He was President (founder) of the government board of the National Institute of Criminal Sciences. He is ex-president of the Mexican Academy of Criminal Sciences. He has held various public offices: General Attorney of Justice of the Federal Distrit, Secretary of Labor and social security, Republic General Attorney, and president (founder) of the Agricultural High Court. Author of several books and articles about law, politics and social topics.