Dr. Keller's technical work has been at the leading edge of research and development (R&D) in hydrogen technology, hydrogen infrastructure, and hydrogen codes and standards. He has academic and R&D expertise in combustion, heat transfer, thermodynamics, mass transfer, fluid dynamics, gas dynamics, and materials science. His applied science leadership stems from managing a hydrogen program overseeing long-term, multi-million-dollar R&D projects with numerous partners and stakeholders. As an entrepreneur he has founded technical consultancies providing guidance and project oversight to governments, international organizations, and private interests.

Starting in 1983, for nearly three decades, Dr. Keller was involved in combustion and hydrogen R&D at Sandia National Laboratories (SNL). The last 18 years at SNL he built and administered a globally recognized hydrogen program. Projects he directed included: hydrogen fueled conventional technologies (internal combustion and turbine), fuel cell development for transportation, hydrogen storage, hydrogen effects on materials, thermochemical solar and nuclear hydrogen production, and the science and engineering behind international codes and standards for hydrogen deployment. Following SNL, he founded a technical consulting firm in California with the primary focus on hydrogen codes and standards development for the US Department of Energy (DOE). In this capacity, he provides leadership and represents the DOE in national and international bodies such as ISO TC 197, H2USA, FCHEA, HySafe, and IPHE. His combination of technical, management, and international regulatory expertise uniquely qualifies him to develop technical teams, support hydrogen infrastructure deployment oversight, and manage globally scalable hydrogen initiatives.

Dr. Keller is the recipient of numerous distinctions and technical awards and has over 175 publications, including four patents. Dr. Keller studied Industrial Engineering at New Mexico State University, received a BS in Mechanical Engineering at UC Santa Barbara, and an MS and Ph.D. in Mechanical Engineering at UC Berkeley.