[1] Following his graduation Hallaj joined the Jacksonville University, Florida, as a lecturer and taught there until 1970.
[2] He was appointed vice president of Birzeit University and then was named as the first director of the Council for Higher Education in the West Bank and Gaza.
[1] After the end of his study visit in 1983 he returned to Birzeit University, but the Israeli authorities did not grant him a work permit.
[3] He headed Palestinian delegation during the multilateral talks on refugees which had been initiated after the Madrid Conference in 1991.
[1] He was among the contributors of the 1988 book entitled Blaming the Victims: Spurious Scholarship and the Palestinian Question edited by Edward Said and Christopher Hitchens.