1- School on nonlinear functional analysis and applications to differential equations, 15 April 1996 - 3 May 1996, ICTP, Trieste, Italy.

2- Al-Azhar first conference in computer science its applications in Math. & Stat., November 2001, Al-Azhar University, Egypt.

3- First International Conference on Engineering Mathematics and Physics (EMP), May. 14-16, Military Technical College, Cairo, Egypt.

4- International Congress of Mathematics ICM2002, August 20-28, 2002, Beijing, China.

5- The Egyptian Mathematical Society International Conference on Mathematics: Trends and Developments, December 28-31, 2002, Cairo, Egypt.

6- Summer School and Conference on Dynamical Systems, 19 July-6 August 2004, ICTP, Trieste, Italy.

7- Advanced School and Conference on Non-Commutative, 9 August - 27 August, ICTP, Trieste, Italy.