Sandia National Laboratories recently hosted a one-day “Colloquium on Chemical Dynamics” to celebrate the extraordinary career of David Osborn, a distinguished physical chemist in the Combustion Research Facility. The event brought together 70 colleagues, collaborators, and friends—including several who traveled from Europe—to honor David’s scientific contributions, leadership, and lasting impact on the field of chemical physics. Over the course of his 27 years at Sandia, David has become renowned for his pioneering research in gas-phase chemical dynamics and kinetics, photodissociation dynamics, time-resolved photoionization mass spectrometry, photoelectron spectroscopy, and combustion and atmospheric chemistry. His work has advanced our understanding of complex chemical processes and has been instrumental in addressing critical challenges in energy and environmental science.