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Marathon Fusion

Marathon Fusion is a company developing industrial-scale isotope production technologies for the fusion fuel cycle, radioisotopes, lithium enrichment, and precious metal co-production.

Last updated September 16, 2026

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Overview

Marathon Fusion describes itself as producing isotopes for the new golden age of nuclear technology. Its stated technology areas include lithium enrichment, a fusion fuel cycle featuring what it calls the world's first isotopically selective tritium pumping system, radioisotopes for next-generation therapeutics, and scalable gold production through precious metal co-production at fusion power plants. The company was co-founded in 2023 by Adam Rutkowski, previously a Propulsion Engineer at SpaceX and a PhD candidate in Plasma Physics at Princeton University, and Kyle Schiller, previously a Science Policy Fellow at Schmidt Futures. Marathon states it is supported by $18m in funding across the US Department of Energy, Breakthrough Energy's fellows program, and leading private investors. Kyle Schiller serves as CEO and Adam Rutkowski as CTO.

History

Marathon Fusion was co-founded in 2023 by Adam Rutkowski, previously a Propulsion Engineer at SpaceX and a PhD candidate in Plasma Physics at Princeton University, and Kyle Schiller, previously a Science Policy Fellow at Schmidt Futures. The company states that it believed then, and now more than ever, that fusion is humanity's best path to abundant, clean and reliable energy. Marathon reports being supported by $18m in funding across the US Department of Energy, Breakthrough Energy's fellows program and leading private investors. Its leadership includes Kyle Schiller as CEO and Adam Rutkowski as CTO.

Products and positioning

Industrial-scale isotope production for critical industries, framed around an 'Isotopes for the New Golden Age of Nuclear Technology' theme.

  • Lithium Enrichment

    Technology to produce enriched lithium domestically at throughputs and costs for commercial nuclear demand.

  • Fusion Fuel Cycle

    Described as the world's first isotopically selective tritium pumping system to enable commercial fusion power that is economic, reliable, and easy to license.

  • Radioisotopes

    Delivering isotopes to power next-generation therapeutics.

  • Scalable Gold Production

    Precious metal co-production generating additional revenue for each fusion power plant.

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