· 1999 – Present Professor
Department of Industrial Engineering – Faculty of Engineering – King Abdulaziz University – Saudi Arabia
· 1998 – 1999 Professor
Department of Production Engineering – Faculty of Engineering – Helwan University – Egypt
· 1992 – 1998 Associate Professor
Department of Production Engineering – Faculty of Engineering – Helwan University – Egypt
· 1986 – 1992 Assistant Professor
Department of Production Engineering – Faculty of Engineering – Helwan University – Egypt
· 1982 – 1983 Lecturer
Department of Production Engineering – Faculty of Engineering – Helwan University – Egypt
· 1979 – 1982 Demonstrator
Department of Production Engineering – Faculty of Engineering – Helwan University – Egypt
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