Head of Computer Science Department Faculty of Computer and Information Sciences Ain Shams University , Cairo, Egypt since Sept 2006 till now Dean of the Faculty of Informtion Technology , MISR University for Science & Technology, 6 of October City, Egypt since February 2006 till Sept 2006 Prof. of Computer Science, Computer Science Dept., Faculty of Computer and Information Sciences, Ain Shams University, Cairo, Egypt Since 1996 till now).. Visting Professor & Vice Dean, Faculty of Science & Information Technology, Al-Balqa Applied University, Jordan ,March 2003 – August 2004, ( Prof. Of Computer Science at IT Dept.,Member Board of Faculty of Higher Scientific Research) Head of Computer Science Department & Vice Dean, Faculty of Computer and Information Sciences, Ain Shams University (97- Feb 2003). Visiting Professor, Faculty of Administration and Economic, King Abdelaziz University, Kingdom of Saudi Arabia (1990-1995). Professor of Computer Science, Faculty of Science, Ain Shams Univesity, (1989-1996). Director of Scientific Computing Center, Ain Shams University. (1984-1990).