Dean of the Institute of Computer & Information Technology of Aviation & Aerospace, Civil Aviation Academy & Ain Shams University, Cairo, Egypt, from 16/2/2009 to date. Vice Dean for Education & Student Affairs, Faculty of Computer and Information Sciences, Ain Shams University, Cairo, Egypt, from 28/7/2008 to date. Professor in Computer Science Department, Faculty of Computer and Information Sciences, Ain Shams University, Cairo, Egypt, from 31/10/2007 to date. Research conducted: Artificial Intelligence, Expert Systems, Image Processing, Neural Networks, Cryptography, Computational Models, Remote sensing and Microwave Tomography. Associate Professor, in Computer Science Department, Faculty of Computers & Information Technology, King AbdulAziz University, Jeddah, Kingdom of Saudi Arabia from 1/9/2001 to 31/10/2007. Associate Professor, in Computer Science Department, Faculty of Computer and Information Sciences, Ain Shams University, Cairo, Egypt, from 24/4/ 2000 to 31/10/2007. Consultant, in University Information Network, Ain Shams University, Cairo, Egypt, from 1992 to 2001. Assistant Professor, in Computer Science Department, Faculty of Computer and Information Sciences, Ain Shams University, Cairo, Egypt, from 6/2/1999 to 24 / 4 / 2000. Assistant Professor, Faculty of Science, Ain Shams University, Cairo, Egypt, from 29/3/1993 to 6/2/1999. Assistant Lecturer, Faculty of Science, Ain Shams University, Cairo, Egypt, from 9/8/1984 to 29/3/1993. Demonstrator, Faculty of Science, Ain Shams University, Cairo, Egypt, from 9/11/1979 to 8/8/1984.