Mathematician (Chern-Simons theory) and Cold-War NSA/IDA codebreaker who left over Vietnam, chaired Stony Brook math, then founded the Renaissance Technologies hedge fund (Medallion Fund) and, in 1994, the Simons Foundation - the science-philanthropy vehicle that in 2021 installed David Spergel, NASA's UAP-study chair, as its president. Died 2024.
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