When one door closes, another opens; but we often look so long and so regretfully upon the closed door that we do not see the one that has opened for us.
by Alexander Graham Bell

My talks at IMPA (streaming videos)

Geometry of Gelfand-Cetlin integrable system (Conservative dynamics and symplectic geometry  2009):

http://strato.impa.br/videos/workshop_geometry/geometry_070809_03.avi

Dynamics on Poisson manifolds (Poisson 2010):

http://strato.impa.br/videos/poisson/poisson_26072010_nguyen.flv

(now that I listened to my own talk at IMPA, I found that my English was really horrible !)

For all video lectures recorded by IMPA:

http://video.impa.br