Professor Mendlovitz joined the Rutgers faculty in 1956. He is the founding director of the World Order Models Project and chair of the International Steering Committee of Global Action to Prevent War. Global Action is a transnational coalition of individuals, civil society organizations, and states promoting a comprehensive political and legal program which aims over the next three to four decades to drastically reduce armed violence, war, internal armed conflict, and genocide. He holds membership on various boards, including the Arms Control Association, Global Education Associates, the Law and Humanities Institute, and the America-Israel Council for Israeli Palestinian Peace. He represents the International Association of Lawyers Against Nuclear Arms at the United Nations and is a member of the Lindisfarne Association, Council on Foreign Relations, and the Lawyers Committee on Nuclear Armaments.

Professor Mendlovitz has written and spoken extensively on issues relating to international law and to the promotion of a just world order. His publications include 10 volumes, many in collaboration with professor Richard Falk, Princeton University. Recent articles include "Defensive Security" in War or Health, with M. Datan (Zed Books); "Basic U.S. Commitment to Defend South Vietnam War Was Unlawful Under Both International and Constitutional Law," in The Real Lessons of the Vietnam War (Carolina Academic Press); and "A UN Constabulary to Enforce the Law on Genocide and Crimes Against Humanity," with J. Fousek, reprinted in The International Legal System in Quest of Equity and Universality (Cluwer Law International). His most recent books are Preferred Futures for the United Nations (Transnational Publishers) and A Reader on Second Assembly and Parliamentary Proposals (Center for UN Reform Education).