He was the Carl F. Braun Professor of Engineering and Control & Dynamical Systems at the California Institute of Technology.

[citation needed] Thereafter, he worked at various universities and research institutes in the US, Canada, the United Kingdom, France and Germany.

At the California Institute of Technology he was the Carl F. Braun Professor of Engineering and Control & Dynamical Systems.

[1] Marsden, together with Alan Weinstein, was one of the world leading authorities in mathematical and theoretical classical mechanics.

[4] In 2005, he won the prestigious John von Neumann Lecture,[5] which is awarded by SIAM to recognize outstanding contributions to the field of applied mathematical sciences and for their effective communication to the community.