Member, Executive Committee, International Society for the Interaction of Mechanics and Mathematics (I.S.I.M.M.), 1988-1995.

Member, Executive Committee, Société de Mathématiques Appliquées et Industrielles (S.M.A.I.), 1992-1998.

Organizer (with K. KIRCHGÄSSNER) of the Conference “Lower-Dimensional Theories and Domain Decomposition Methods in Mechanics”, Oberwolfach, 20-24 July 1992.

Organizer (with L. TRABUCHO and J.M. VIAÑO) of the Conference “Asymptotic Method for Elastic Structures”, Estoril, 4-8 October 1993.

Organizer (with D. CIORANESCO and M. IOSIFESCU) of the Third French-Romanian Symposium “Analysis and Modeling”, Cluj-Napoca, 23-27 September 1996.

Chair, Academic Advisory Committee, École Polytechnique, Palaiseau (1997-2002).

Organizer (with M. BERNADOU and J.M. VIAÑO) of the “International Conference on Shells”, University of Santiago de Compostela, 14-18 July 1997.

Member, Executive Committee, International Society for the Interaction of Mechanics and Mathematics (I.S.I.M.M.), 1998-2001.

Honorary member, “Liu Bie Ju Centre for Mathematical Sciences”, City University of Hong Kong, 1998-2002.

Member, Selection Committee, “Theodore von Kármán Prize”, S.I.A.M. (J. E. MARSDEN, Chair), 1998.

Co-Director (with LI Ta-tsien), “Chinese-French Institute of Applied Mathematics”, Paris and Shanghai (1999-2001).

Organizer (with D. ARNOLD and I. BABUŠKA, Chairs, and F. BREZZI and J. PITKÄRANTA) of the Workshop “Shells: Modeling, Analysis and Numerics”, Mathematical Sciences Research Institute, Berkeley, 17-28 April 2000.

Organizer of the Doctoral Programme “Mathematics and its Applications”, Central European University, Budapest (since 2000-2002).

Chair, Scientific Council of the “Chinese-French Institute of Applied Mathematics”, Paris and Shanghai (2001-2003).

Member, Evaluation Committee of the Department of Mathematics of the University of Zürich (F. HIRZEBRUCH, Chair), 29-31 October 2001.

Organizer (with LI Ta-tsien and A. PIRIOU) of the ISFMA Symposium - CIMPA School “Plates and Shells”, Fudan University, Shanghai, 20-31 August 2001.

Organizer (with Roderick WONG) of the “International Conference on Nonlinear Partial Differential Equations - Theory and Approximation”, City University of Hong Kong, 29 August - 02 September 2002.

Organizer (with Roderick WONG) of the “Mathematical Analysis and its Applications Colloquium”, Liu Bie-Ju Centre for Mathematical Sciences, City University of Hong Kong, since September 2002.

Organizer (with Felipe CUCKER) of the “Department of Mathematics Colloquium”, City University of Hong Kong, since September 2002.

Deputy Director (Director : Roderick WONG) of the Liu Bie-Ju Centre for Mathematical Sciences, since October 2002.

Member, Council of the Légion d'Honneur Club-Hong Kong Chapter (Dr. James KUNG, President), since November 2002.

Member, Scientific Council of the France-China Foundation for Sciences and their Applications (J. CAEN, and G. KAHN, Co-Chairs), since February 2004.

Co-Chair (with Qiang ZHANG) of the Organizing Committee (members : Felipe CUCKER, Hui Hui DAI, Tong YANG) of the "International Conference on Mathematics and its Applications", in Honor of the Sixtieth Birthday of Roderick Wong, City University of Hong Kong, 28-31 May 2004.

Organizer of the "France-Hong Kong Distinguished Lecture Series'', a series of high-profile lectures under the auspices of the French Academy of Sciences, organized jointly by the Consulate General of France in Hong Kong, the French Academy of Sciences, and City University of Hong Kong, since January 2005.

Co-organizer (with Roderick WONG) of the "William Benter Distinguished Lecture Series'', a series of distinguished lectures in pure and applied mathematics held at City University of Hong Kong, since January 2005.

Member, Honorary Award Committee, City University of Hong Kong, since January 2005.

Organizer of the session "Applied Differential Geometry'' at the "Third Pacific Rim Conference on Mathematics", Fudan University, Shanghai, 17-21 August 2005.

Member of the "Physical Sciences Panel'', of the Research Grants Council (RGC), Hong Kong, August 2005-August 2007.

Organizer (with Li Ta-tsien) of the ISFMA Symposium - CIMPA School "Differential Geometry: Theory and Applications", Fudan University, Shanghai, 07-18 August 2006.

Member, Selection Committee, "ICIAM Su Buchin Prize 2007" (LI Ta-tsien, Chair), 2006-2007.

Member of the Selection Committee of the Research Grants Council Joint Research Schemes on travel grants and workshop/seminar grants, since June 2007.

Coordinator, on behalf of City University of Hong Kong, of visits made under the Agreement on Academic Exchange between City University of Hong Kong and Collége de France, Paris, France since March 2007.

Head of the Division of Mathematics and Computer Science of the European Academy of Sciences, Brussels, since March 2007.

Member of the Selection Committee of the Research Grants Council Joint Research Schemes on travel grants and workshop/seminar grants, since June 2007.

Co-Chair (with Robert M. Miura and Roderick WONG) of the organizing Committee (members: Felipe CUCKER and Ya-Yan LU) of the "Fourth Pacific Rim Conference on Mathematics, also celebrating the Tenth Anniversary of the Liu Bie Ju Centre for Mathematical Sciences'', City University of Hong Kong, 07-11 December 2007.