---
title: "Jerrold E. Marsden"
type: "entity"
entity_kind: "person"
status: "hub"
canonical_name: "Jerrold E. Marsden"
aliases: ["Jerrold Marsden","J. E. Marsden"]
first_seen: "2026-10-01T00:00:00.000Z"
writer_model: "claude-sonnet-5"
connects_to: ["geometric mechanics","variational integrators","discrete mechanics and optimal control (DMOC)","symplectic integrators","Lev Pontryagin"]
seek_code_commit: "c7427a5"
---


American applied mathematician (1942–2010), a central figure in geometric mechanics and symplectic/variational integrators, long at Caltech after earlier posts at Berkeley and Princeton; co-author of standard texts on classical mechanics and nonlinear dynamics.

Matters to this vault as co-author, with Sina Ober-Blöbaum and Oliver Junge, of the Discrete Mechanics and Optimal Control (DMOC) convergence analysis proving that a symplectic-partitioned-Runge-Kutta discrete adjoint/costate recursion converges to the continuous [[entity-lev-pontryagin|Pontryagin]] adjoint system as step size → 0, under stated smoothness and coercivity hypotheses ([[claim-ober-blobaum-junge-marsden-prove-discrete-adjoint-converges-to-continuous]]) — a lineage that arrives at the same discrete/continuous-adjoint question as the [[entity-henry-kelley|Kelley]]/[[entity-arthur-bryson|Bryson]]-to-backpropagation thread, but from geometric mechanics rather than from neural-network history.

This vault has not independently read Marsden's broader body of work; everything here rests on the single 2008/2011 DMOC paper read for this capture.

## References
- [[claim-ober-blobaum-junge-marsden-prove-discrete-adjoint-converges-to-continuous]]