Professional service and memberships

• Coordinating Editor: Physica D
• Editorial Board: Dynamics and Differential Equations; Methods and Applications of Analysis; SIAM Journal of Dynamical Systems
• Chair: Math Awareness Month Committee, 2001
• Scientific Advisory Committee: Office of Naval Research DRI on Predictability, 2000-2003
• Chair, J.D.Crawford Prize Committee, SIAG on Dynamical Systems, SIAM, 2000-1
• Committee on Mathematics in the Geosciences, 2001
• Nominating Committee, SIAG on Dynamical Systems, SIAM, 2001
• Board of Trustees, SIAM, 1998-2000
• Chair: SIAM Activity Group on Dynamical Systems, 1993-5
• SIAM Outstanding Paper PrizeCommittee, 2000
• SIAM Conference Strategic Planning Task Force, 2000
• Advisory Board: SIAM Activity Group on Dynamical Systems, 1995-7
• Program Committee: Progress in Nonlinear Science, 100th. Anniversary, A.Andronov, July, 2001
• Co-organizer: SIAM Meeting on Applications of Dynamical Systems, Snowbird, Utah, October 1992
• Organizer: ONR Workshop on Dynamical Systems and Oceanography, Little Compton, RI, May 1993
• Organizing Committee: SIAM Annual Meeting, Kansas City, July 1996
• Co-organizer: Workshop on ``Dynamical Systems and Nonlinear Optics'' May, 1997, Rhode Island
• Chair of organizing committee: Workshop on ``Multiple Time Scale Dynamical Systems'' Oct. 1997, IMA, Minnesota.
• Organizer: Workshop on ``Dynamical Systems Methods for Lagrangian Transport in the Ocean'' May, 1998, IMA, Minnesota.
• Co-organizer: Workshop on ``Recent Advances in the Stability Theory of Nonlinear Waves'' May, 1998, Rhode Island.
• Member of Scientific Committee for Pacific-Rim Dynamical Systems Conference, Hawaii, August, 2000.
• Member of Program Committee for Conference in honour of 100th anniversary of birth of A.A.Andronov, Nizhny Novgorod, July, 2000
• Member: American Mathematical Society; Society of Industrial and Applied Mathematics; Optical Society of America; American Geophysical Union.