- May 1, 2011 – Present: Professor, Department of Electrical and Computer Engineering, Concordia University, Montreal, Canada, QC H3G 1M8
- May 26, 2014 – May 2018: Visiting Professor of National 111 Project Base on Electromechanical Coupling Theory and Key Technology for Electronic Equipment, Xidian University, China.
- October 10, 2010 –April 30, 2011: Director of theCenter for Electromagnetic System Research, University of Mississippi, University, MS 38677, USA.
- July 1, 2003 – April 30, 2011: Director of the Antenna Laboratory, Center for Electromagnetic System Research, University of Mississippi, University, MS 38677, USA
- July 1, 1995 – April 30, 2011: Professor of Electrical Engineering, Department of Electrical Engineering, University of Mississippi, University, Mississippi 38677, USA
- July 1, 2009 – July 31, 2010: Visiting Professor at Department of Signals and Systems, Chalmers University of Technology, while on sabbatical leave from the University of Mississippi.
- July 1, 1994 – June 30, 1995: Visiting Professor, Department of Microwave Technology, Chalmers University of Technology, Gothenburg, Sweden
- July 1, 1990 – June 30, 1995: Associate Professor, Department of Electrical Engineering, University of Mississippi, University, Mississippi 38677, USA
- August 15, 1986 – June 30, 1990: Assistant Professor, Department of Electrical Engineering, University of Mississippi, University, Mississippi 38677, USA
- In the summer of 1989, I was a Visiting Research Scientist at the Royal Military College of Canada, Kingston, Ontario
- December 1985-August 1986: Research Associate, Electrical Engineering Department, University of Manitoba, Winnipeg, Manitoba, Canada.
- Research Associate for the following projects
- High-performance and low-cost earth station antennas
- SATT vehicular antenna systems
- Monopulse tracking feed for mobile terminal antennas.
- Antenna system studies for Satcom receiver
- September 1981-December 1985: Research and Teaching Assistant (TA), Electrical Engineering Department, University of Manitoba, Winnipeg, Manitoba, Canada
- Research Assistance in the Following:
- Design and investigations of small primary feed for parabolic reflector antennas with trapezoidal and sinusoidal corrugations
- Design and investigation of the coaxial waveguide as a small primary feed. Study of the uniqueness of the phase center and its relation to the feed antenna geometry.
- Numerical investigation of the circular microstrip antennas
- Numerical investigation of the dielectric rod antennas
- Scattering from conducting and dielectric bodies of revolution
- Computer software for electromagnetic problems (FORTRAN)
- 1977-1981: Instructor and Teaching Assistant, Cairo University, Egypt (Area: Descriptive Geometry and all Engineering Mathematics Courses).
Laboratory of Advanced Technology on Antenna and Microwave Systems