جامعة بيت لحم
Hassassian worked at Bethlehem University for twenty five years as a professor of political science and in administrative roles at the University: Dean of Students, Dean of the Faculty of Arts and Chair of the Humanities Department and for the past nine years as the Executive Vice President, during which time he also served as the President of the Rectors' Conference of the Palestinian Ministry of Higher Education and President of the Palestinian-European-American Cooperation in Education (PEACE) program.