International responsibilities

Chief-Editor (with H.Fernholz from T.U.Berlin) of the Europ. J. Mech. B/Fluids 1988-1993 ; Assoc. Ed. 1994-1998.

National Delegate at the General Assembly of IUTAM (International Union of Theoretical and Applied Mechanics) (1984-1996).

Elected at the Executive Committee of ISIMM (Int. Soc. for the Interaction of Mechanics and Mathematics) 1991-1997. Chairman of the Nominating Committee of ISIMM (1999). Representative of IUTAM (Int. Union Theor. Appl. Mechanics) at ISIMM.

Comité de Rédaction (Maths series) Notes Comptes Rendus Acad. Sci. Paris. (1990...) (about 120 notes presented)

Advisory Boards : Journal of Nonlinear Science ( 1991-...), Japan J. Applied Math. (1984-1996), Annales de l’IHP - Analyse Non Linéaire (1984-1997), Europ. J.Mech. B/Fluids (1999...), Quarterly Appl. Math. (1998-...), J. Math. Fluid Mech. (1999-...-), SIADS (SIAM J. on Applied Dynamical Systems- electronic only) (2001-04), Annali dell’Università di Ferrara (2006 -09)

Adviser of the "Texts in Applied Maths", Springer-Verlag (1995-2012)

Member of the ICIAM-Lagrange Scientific Committee (2002-2003)

Vice Chair for the SIAM Activity Group on Nonlinear Waves and Coherent Structures (SIAG/NWCS) for a two-year term (2005 - 2006).

National Responsibilities

Director of J.A.Dieudonné Math lab. (Nice) 1979-1984

Creation with P.Coullet of the Nonlinear Institute of Nice (INLN) in Jan 1991

Director of INLN (about 75 persons in Jan 1995) jan 1991 - dec 1994.

Director of PhD studies (DEA) Turbulence and Dynamical Systems, 1980-1995 (creation with U.Frisch)

President of CNFM (Comité National Français de Mécanique) 1997-2000, 2001-2004 (Vice-Pres. 1992-1996).

Membership of main National scientific Committees :
  Conseil National des Universités (elected) 1984-1992 (Mechanics)
  Comité National de la Recherche Scientifique (CNRS) 1991-1995 (theor. Physics)
  Member of a Ministery committee (GET 10 Maths 1989-1991), High Research Committee of University Blaise Pascal, Clermont-Ferrand (1999)

Institut Universitaire de France (IUF) jury Senior 2012

Organization of Congresses and Summer schools : (most are published)

Les Houches Summer School 1981 Chaotic Behavior of Deterministic systems (co-chairman with R.Helleman et R.Stora)

BTNA (Bifurcation Theory and its Numerical Analysis) Int. Conf. Xi’an (China) July 1988 (co-Chairman with J.Marsden and M.Golubitsky)

Bifurcations and Attractors. Nonlinear year, Sept 1988. Sophia-Antipolis (Chairman)

IUTAM Symp. Nonlinear Hydrodynamic Stability and Transition, Sophia-Antipolis Sept 1990 (Chairman and complete organization)

Applied dynamics and bifurcation theory. Oberwolfach, Jan 1992 (cochairman with J.Marsden, H.Kielhofer, J.Scheurle)

Dynamical Systems Methods in Fluid Mechanics, Oberwolfach, July 1996 (co-Chairman with J. Marsden, K. Kirchgässner, J. Scheurle)

STAMM 98, Symposium on Trends in Applications of Mathematics to Mechanics, Nice, May 1998 (Chairman with co-chaimen O. Guès, A. Nouri)

EQUADIFF 99, Berlin. Chairman of the minisymposium "Steady water-waves"

Organizator of the "Journées de l’Institut Universitaire de France", Nice sept 2002 (pluridisciplinary on the theme of "Instability") 

Co-Chairman with J.Bona, Min Chen and Vassilios Dougalis of a Minisymposium at 5th IMACS (Athens, USA) April 2005

Co-Chairman of the minisymposium (4 sessions) "Modeling and Analysis of Nonlinear waves" of the SIAM Conference on Nonlinear Waves and Coherent Structures NW06

Co-Chairman (with M.Groves) of the two Minisymposia on "three-dimensional water waves" at ICIAM 07 (Zurich, July 2007)

Co-Chairman (with L.Stolovitch) of the Winter school "Dynamics and Partial Differential equations" (St Etienne de Tinée, France,  Jan 2010, Feb 2011, Feb 2012, Feb. 2013)

Chairman of the Conference AMWF (Applied Mathematics, from Waves to Fluids) in honor of Claude Bardos (Nice, Feb 2011)

Co-Chairman (with G. Lebeau, C.Bardos, V.Puckhnachev, P.Plotnikov, A.Chesnokov) of  the Workshop on "Mathematical methods in Fluid mechanics". Lake Baikal, Russia (Sept. 2011)