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Brendan Davis
Staff Page • Member of the Technical Staff. Biography Brendan Davis has been employed at Sandia’s Hydrogen Effects on Materials Laboratory (HEML) since 2015, currently serving as the chief test system engineer. He possesses expertise in designing, building, and operating high-pressure gaseous hydrogen systems and associated controls, as well as performing fracture, tensile,...

Chris San Marchi
Staff Page • Distinguished Member of Technical Staff. Biography Dr. Chris San Marchi is a Distinguished Member of the Technical Staff at Sandia National Laboratories in Livermore CA. Chris and his colleagues are studying the interactions between hydrogen and materials, unraveling the complex nature of hydrogen’s effects on the performance of structural materials,...

Christopher R. Shaddix
Staff Page • Manager, Combustion Research Facility, Plasma & Reacting Flow Science Department. Biography Dr. Shaddix completed his PhD in Mechanical and Aerospace Engineering from Princeton University in 1993. He served as a National Research Council postdoctoral fellow at the National Institute of Standards and Technology (NIST) in Gaithersburg, Maryland. Since 1995, he...

Craig A. Taatjes
Staff Page • Senior Manager. Biography Craig Taatjes is the senior manager for Physical Sciences at Sandia National Laboratories’ Combustion Research Facility (CRF) in Livermore, California. His research focuses on kinetics and mechanisms of fundamental chemical reactions important in combustion and hydrocarbon oxidation. His work has concentrated on direct measurements of elusive intermediates...

Dave Chandler
Staff Page • Fellow, Combustion Research Facility, Transportation Research Center. Biography Dave was born in Albuquerque New Mexico and attended the University of New Mexico where he obtained his bachelors in Chemistry and was captain of the gymnastics team in 1975. He obtained a PhD in Chemistry at Indiana University and performed a...

Ethan Hecht
Staff Page • Principal Member of Technical Staff, Combustion Research Facility. Biography Ethan S. Hecht is a Principal Member of the Technical Staff in the Combustion Research Facility at Sandia National Laboratories. He has broad expertise in hydrogen energy systems, spanning experimental research, safety-informed engineering, and technology development to support the deployment of...

Jeffrey Koplow
Staff Page • R&D System Engineering, Energy Nanomaterials. Biography Jeff Koplow specializes in multi-disciplinary problem solving in the physical sciences and their corresponding engineering disciplines. Over his 22-year research and development (R&D) career, he has developed expertise in physical chemistry, chemical kinetics, atmospheric chemistry, instrumentation, electronics (digital, analog, power, and RF), spectroscopic sensing,...

Joe Ronevich
Staff Page • Principal Member of Technical Staff, Hydrogen and Material Science. Biography Joe Ronevich is a Principal Member of the Technical Staff in the Hydrogen and Materials Science department. He is a co-principal investigator in the Hydrogen Effects on Materials Lab (HEML) located in Livermore, CA. His research focuses on hydrogen embrittlement...

Jonathan H. Frank
Staff Page • Distinguished Member of Technical Staff, Combustion Research Facility, Reacting Flows. Biography As the Principal Investigator of the Advanced Imaging Laboratory, Jonathan Frank has extensive experience in the development and application of laser diagnostics for multidimensional imaging of chemically reacting flows. As a leader in his field, he has made important...

Krupa Ramasesha
Staff Page • Principal Member of Technical Staff. Biography Krupa Ramasesha is a Principal Investigator at Sandia National Laboratories, Livermore, where she is leading a research program investigating ultrafast dynamics in gas phase and condensed phase systems, funded by the DOE/BES Gas Phase Chemical Physics Program and the Laboratory-Directed Research and Development Program....

Leonid Sheps
Staff Page • Principal Member of Technical Staff. Biography Leonid (Lenny) Sheps is a Principal Member of the Technical Staff at Sandia National Laboratory. His current research interests include reaction kinetics and dynamics in the gas phase and at gas-liquid interfaces. He leads the Sandia effort within the joint Argonne-Sandia Consortium on Pressure-Dependent...

Olivia Krohn
Staff Page • Jill Hruby Postdoctoral Fellow. Biography Olivia Krohn is a Jill Hruby Postdoctoral Fellow at Sandia National Laboratories where she conducts research on inelastic collisions between molecules in crossed molecular beams. Her fellowship proposal outlined a technique to enhance collision energy resolution and quantum state control using quantum cascade lasers. She...
Olivia Krohn

Timothy S. Zwier
Staff Page • Distinguished Member of Technical Staff, Gas Phase Chemical Physics Program, Combustion Research Facility. Biography Tim Zwier joined Sandia National Laboratories’ Combustion Research Facility (CRF) in January 2020 after spending much of his independent research career in academia. Zwier had served as PhD research advisor for more than 40 graduate students...