Full professor at El Colegio de Mexico since 1977. He has taught at various universities in Mexico, the United States, and Europe. Since 2014 he has been affiliated with the FXB Center for Health and Human Rights at the Harvard School of Public Health. He has written dozens of books and scholarly articles. He writes a weekly column in Reforma, as well as 14 other newspapers. Since March 2001, he has been a member of Primer Plano, Canal 11's weekly TV talk show. Throughout his career, he has actively promoted democracy and human rights. He has been president of the Mexican Academy of Human Rights, Civic Alliance, and FUNDAR, among other institutions. In 2014, he founded at El Colegio de Mexico the influential Seminar on Violence and Peace that conducts research, organizes courses for public officials and victims’ organizations, and has a monthly public discussion with the protagonists of war and peace.