Hadron Energy hires Brian Arnholt as director of reactor systems in six-person team expansion

Hadron Energy, Inc.

Hadron Energy, Inc.

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  • Hadron Energy added six senior hires across engineering, program management, and finance as it advances the Halo microreactor toward commercialization.
  • Brian Arnholt appointed director of reactor systems; previously a senior consultant at Sargent & Lundy, former NuScale engineering manager and principal I&C engineer.
  • Ian Francis joined as probabilistic risk assessment engineer; previously a senior PRA engineer on TerraPower’s Natrium project, former licensed senior reactor operator at Talen Energy.
  • Rufino Ayala named lead instrumentation and controls engineer; previously chief engineer at Paragon Energy Solutions/Rock Creek Innovations, co-inventor of an FPGA-based protection system.
  • Artem Sergienko appointed controller; joined in January 2026, previously held senior controllership roles at Stem and Natera, former revenue controller at GE Digital.


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