He returned to his "alma mater", this time as faculty occupying various posts throughout his career in the institution and teaching different courses; along his incursion in the institution, he was Dean of the Faculty of Law from 1967 to 1969, Director of the Department of Public Law from 1974 to 1980. In 1980 he became the Vice President of the Regional Committee for the Protection of Human Rights in Medellín; for his work in this institution and in the University of Antioquia, he became involved in a campaign by paramilitary forces in Colombia to weed out their detractors, among them Gaviria; he received death threats and was forced to go into exile in Argentina. He returned later and resumed his work at the University of Antioquia as Director of the Institute of Political Science in 1988, and Deputy Rector of the University from 1989 to 1992.