- 1990-1998
Research Assistant, Marine Chemistry Lab, National Institute of Oceanography & Fisheries, الاسكندرية, مصــــــــر
- 1998-2003
Assistant lecturer, Marine Chemistry Lab, National Institute of Oceanography & Fisheries , الاسكندرية, مصــــــــر
- 2003-2005
Research Assistant, Department of Chemistry and Biochemistry, Duquesne University, بتسبيرج, امــريــكـا
- 2005-2007
Teaching Assistant, Department of Chemistry and Biochemistry, Duquesne University, بتسبيرج, امــريــكـا
- 2007-2008
Head Teaching Assistant and Supervisor of General Chemistry Laboratories, Department of Chemistry and Biochemistry, Duquesne University, بتسبيرج, امــريــكـا