Member of the selection committee of the IBM prize in scientific
computation
Member of the selection committee of the Seymour CRAY prize in scientific
computation
Member of the selection committee of the CISI prize in scientific computation
Member of the French Delegation to the mathematical committee at Kobe,
Japon, and participation to ICM 90, Kyoto, Japon
Member of the program committee for CICIAM95
President of the selection committee of the LAGRANGE prize, CICIAM99
Member of the selection committee of the CICIAM99 prizes
Member of the scientific committee of CERFACS (Toulouse)
President of the scientific committee of the "Centro de Matematica Aplicada.
Intituto Superior Technico" Lisboa (Portugal) (2003)