1. As a Vice President (for East Africa) of the African Mathematical Union, I participated in the first “Pan-African Space on Mathematics” in the period November 6-9, 2006, I also attended the Meeting of the Executive Committee of the African Mathematical Union in the period November 4-5, 2006, in Tunis, Tunisia.
2. School on Nonlinear Differential Equations. ICTP Trieste, Italy, October 9-27, 2006.
3. International Congress of Mathematicians 2006. Madrid, Spain, August 22-30, 2006.
4. Workshop: Case series studies: rationale, design and analysis, Instructor: Prof. Paddy Farrington, The Open University, UK. Faculty of Health Sciences, American University of Beirut, Beirut-Lebanon, Tue. 21st Feb. 2006.
5. International Meeting on Grid and Parallel Computing, January 4th-7th, 2006, CAMS, American University of Beirut, Beirut-Lebanon.
6. The X Lectures Mathematics and Society: Past, Present and Future (Celebration of the Tenth Anniversary of CAMS Chaired by Sir Micheal Atiyah). February 20, 2006, CAMS, American University of Beirut, Beirut-Lebanon.
7. 3rd Workshop on Spatial Dynamic Models of Economics and Ecosystems. ICTP, Trieste, Italy, April 11-13, 2005.
8. Workshop on Infectious Disease: Theoretical, Ecological and Economic Approaches. ICTP, Trieste, Italy, April 13-15, 2005.
9. 6th Pan-African Congress of Mathematicians. Tunis, Tunisia, September 01-06, 2004.
10. Summer School and Conference on Dynamical Systems. ICTP, Trieste, Italy, July 19 to August 6, 2004.
11. International Congress of Mathematicians 2002. Beijing, China, August20-28, 2002.
12. Workshop on modeling Real Systems: A Hand-On First Encounter with Industrial Mathematics. ICTP, Trieste, Italy, September 27 to October 22, 1999.
13. Workshop on Dynamical Systems. ICTP, Trieste, Italy, August 31 to September 18, 1998.
14. CIMPA-UNSA-UNESCO-BURKINA School, evolution equations and applications. Ouagadougou, Burkina Faso, July 13-31, 1998.
15. Workshop on Dynamical Systems. ICTP, Trieste, Italy, May 22 to June 2, 1995.
16. IVth Pan-African Congress of Mathematicians. Ifrane, Morocco, September 18-26, 1995.
17. First Scientific Conference (Science and Development). Faculty of Science, Al-Azhar University, Cairo, Egypt, March 20-23, 1995.
18. The Second Jordanian Mathematics Conference. Mu’tah University, Mu’tah, Jordan, September 11-14, 1994.
19. Workshop on Qualitative Aspects and Applications of Nonlinear Evolution Equations. ICTP, Trieste, Italy, May 3-14, 1993.
20. Second Autumn Workshop on Mathematical Ecology. ICTP, Trieste, Italy, November 2-20, 1992.
21. Conference on Mathematical Ecology. Raleigh, (U.S.A.), March 7-9,1986.
22. NSF-CBMS Regional Conference on Mathematical Ecology. Davis, (U.S.A.), March 18-22, 1985.
23. Mathematical Modelling Seminar. Harvey Mudd College, (U.S.A.), 1984-1985.
24. Applied Math/Biomathematics Seminar. Harvey Mudd College, (U.S.A.),1984-1985.
25. Meeting on Integro-Differential Evolutions and Applications. Trento, Italy, September 2-8, 1984.
26. Applied Mathematics Seminar. Claremont Graduate School, (U.S.A.),1983-1984.
27. Biomathematics Seminar. Harvey Mudd College, (U.S.A.), 1983-1984.
28. SIAM 30th Anniversary Meeting. Stanford University, (U.S.A.), July18-23, 1982.
29. NASA Workshop on Surface Fitting. Centre for Approximation, Texas A & M University, (U.S.A.), May 17-19, 1982.