He joined the Theoretical Design Division of Los Alamos National Laboratory (LANL) in 1972 where he worked on the physics of strong shock waves and high-temperature hydrodynamic phenomena.

[2] A result discovered in this work was later used to substantiate the accuracy of the Los Alamos on-site yield verification method (CORRTEX) for the US-USSR Threshold Test Ban Treaty (TTBT).

[4] Darryl's main research contributions have been in nonlinear science, from integrable to chaotic behaviour, from solitons to turbulence, and from fluid dynamics to shape analysis.

[1] Darryl's main activities have been based on his use of geometric mechanics to derive and analyse nonlinear evolution equations for multiscale phenomena.

[8] Recently Darryl received an ERC synergy grant[9][10] together with Dan Crisan, Etienne Memin and Bertrand Chapron to perform research on stochastic transport in the upper ocean (2020-2025).