 Complete the following phrase:  Garretón studied Sociology in the Catholic University of Chile and graduated in 1967. He received his PhD at the École des Hautes Études en Sciences Sociales of Paris. He directed the Catholic University of Chiles Centro de Estudios de la Realidad Nacional CEREN from 1970 until its closing in 1973. He also edited CERENs journal Cuadernos de la Realidad Nacional during those same years. In 1973, he was the Dean of the Area of Interdisciplinary Social Studies at the Catholic University. After the 