members
STEPHEN LISIUS
Technical Advisor
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Stephen Lisius is a technical advisor for Fissionaire with a background in rapid hardware development, testing, and operations gained through more than six years at SpaceX. His experience spans the full engineering lifecycle, on some of the world's most advanced aerospace systems.
At SpaceX, Stephen held increasingly complex technical roles supporting Falcon, Dragon, Raptor, and Starship programs. His work included developing and testing critical fluid and mechanical systems, leading large-scale qualification campaigns, supporting flight operations, and serving as Responsible Engineer for Starship propellant control hardware. His hands-on experience operating and validating systems in extreme thermal, pressure, and operational environments reflects the rigorous engineering discipline required for next-generation energy technologies.
At Fissionaire, Stephen applies his expertise to help accelerate the deployment of advanced nuclear technologies. His background in solving complex engineering challenges under aggressive schedules aligns closely with Fissionaire's mission to modernize and scale clean energy infrastructure.
Stephen holds both Bachelor of Science and Master of Science degrees in Aerospace Engineering from the University of Michigan, graduating Summa Cum Laude.
• Rapid hardware development in high-performance engineering environments
• Systems ownership from concept and testing through production and operations
• Cross-functional leadership across design, manufacturing, test, and flight teams
• Strong technical problem-solving in safety-critical and mission-critical applications
• Proven ability to execute complex programs under aggressive development schedules
• Responsible Engineer for Starship cryogenic propellant control valves and fluid systems
• Led a two-year Falcon qualification campaign involving NASA's Space Environments Complex and a 50+ person engineering team
• Extensive experience with cryogenic systems, high-pressure fluids, hydraulics, heat exchangers, and structural testing
• Performed qualification, anomaly investigation, and validation testing for Falcon, Dragon, Starship, and Raptor programs
• Supported real-time flight operations and mission-critical decision making during Starship test flights
• Experience with reusable launch vehicle development, system commissioning, and operational readiness testing
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