 From 1975 to 1984 he served at the "Institute for Conflict Research" in Vienna - first as a "Research Fellow" and later on as a "Deputy Director".During this period he also completed his habilitation at the Johannes Kepler University Linz and carried out post-doctoral research at Harvard University.From 1984 to 1988, Marin held the chair for "Comparative Political and Social Research" at the European University Institute in Florence.