 Grin studied economics at the University of Geneva, where he obtained a doctorate summa cum laude in 1989.He then was a teacher at the universities of Montreal and Washington (in Seattle), assistant professor at the University of Geneva and vice-director of the European Centre for Minority Issues in Flensburg, Germany.Since 2001 he is a visiting professor at the University of Lugano, in 2003 he became professor at the University of Geneva.