Dean of the Science Faculty: Bethlehem University, 1989-1992. Chairman of the Life Sciences Department; Bethlehem University, 1988-1992 and 1998-present.

INSTRUCTOR, Life Sciences Department, Bethlehem University, since September 1981. Taught animal physiology, nutrition and diet therapy, principles of biology, developmental biology , cell biology, histology, animal production, human anatomy and physiology, topics in biology and biochemistry.

GRADUATE RESEARCH ASSISTANT, Oregon State University. 1979- 1981. Worked with ruminal fistulated steers and sheep, and measured rate of digestion, rumen pH, volatile fatty acids and feed intake; feedstuffs and by products evaluation and animal husbandry.

SUPERVISOR, of Teachers' of Agricultural Education, West Bank, 1973-1974 and 1976-1977. In both cases I was in charge of planning and coordinating the programs of agricultural education.

SECONDARY SCHOOL TEACHER. West bank. 1970-1976. taught general biology and chemistry and was advisor of the science club at the school.

Editor-in-chief, Bethlehem University J. 1993 - present. and editorial board of Shu'un Tanmawiyyeh J. (developmental J.) 1991- present.