After a study period in Lebanon, Professor Nahas obtained a D.E.A. in Mathematics from Université de Paris and a PhD in Education, from Université René Descartes - Paris V, France.
He is currently Vice President of the University of Balamand in charge of Planning and Educational Relations, and Dean of the Faculty of Library and Information Studies. Previously, he taught at the Lebanese University, at St. Joseph University and since 1988 he has been working at the University of Balamand.
He was the Principal of the Collège Notre Dame du Balamand (1975–1993), Dean of the Faculty of Arts and Social Sciences, at the University of Balamand (1988–1995), and Dean of the Saint John of Damascus Institute of Theology, at the University of Balamand (2005-2010).
He is Professor of Education; Member of the Lebanese Association of Educational Sciences (LAES) since 1995; Member of the National Committee of the "Ministry of Education and the Higher Education", since 1996; and he sits on the Société Européenne pour la Formation des Ingénieurs (SEFI), Belgique, since 2008.
Prof. Nahas has also participated in many international seminars and published a large number of articles, three manuals of teaching and three books related to his fields of interest. He has also published many articles and four books related to the Orthodox Church. His academic research focuses on Cognitive Psychology in the Field of Conceptualization and the impact of the Conceptual Fields' Theory on different aspects of school and university education, mainly in terms of efficiency and quality.