- House officer in Mansoura University Hospital from 1/9/1979 to 31/8/1980.
- Physician in the Hospital of Ministry of Health from 1/9/1980
- Demonstrator in the Medical Biochemistry Department in Mansoura University from 15/6/1981 to 3/3/1985.
- Assistant Lecturer of the Medical Biochemistry from 4/3/1985 to 26/6/1988.Assistant
- Professor of Medical Biochemistry from 27/6/1988 to 27/3/1994.
- Associate Professor of Medical Biochemistry from 28/3/1994 to 24/11/2000.
- Professor of Medical Biochemistry from 25/11/2000 till now.
- Teaching Medical and Clinical Biochemistry Courses for Students in the Faculty of Nursing and Students of Health Institute in Mansoura University.
- Teaching Medical and Clinical Biochemistry and Molecular Biology courses for students of the faculty of medicine and faculty of medical technology of the University of Omar Al Mokhtar, Libya.