
Joseph S. Finberg
aka Joe FinbergJoe leads the Laurelin program. He read physics and philosophy at Columbia and Oxford, and spent four years inside fusion-energy research before crossing into quantitative trading for a little over six years. The trading work was the discipline that built the company: a daily exposure to capital allocation, to risk under uncertainty, and to the difference between a thesis that survives contact with the market and one that does not. Coming back to fusion in 2024, he carried that discipline with him.
His intellectual method is to refuse the easy frame. The dominant story in fusion is that the physics is hard; Joe argues that the physics is the easy part and that the engineering integral — closing a complete reactor inside a transportable envelope at venture-capex scale — is what the field has been getting wrong. Within that frame, choosing deuterium–deuterium fuel over deuterium–tritium is not a contrarian flourish; it is the only choice that lets a forty-foot ISO container hold the whole machine, with no tritium plant, no breeding blanket, no civil works.
At Laurelin, Joe authored the whitepaper that the company runs on, the component blueprints, the patent claim map, and the procurement plan. He runs the bench day-to-day with Boruch and the engineering team, takes the customer conversations with hyperscalers and defense buyers, and writes the long-form essays that argue the political-economic case for an exit from the petrodollar arrangement at full length.
Recent and ongoing writing includes the company whitepaper (RDG-01-FRC, 2025–) and the inaugural Manifesto essay “Exit from the cost ledger” (2026), the first in a planned series working outward through each of the four architectural commitments.
- Columbia & Oxford · B.A. Physics & Philosophy


