American computer scientist who joined Renaissance Technologies from IBM in 1993 — becoming co-CEO with Peter Brown — and who became controversial for his political funding of Breitbart News, Donald Trump's 2016 campaign, and Cambridge Analytica.
Contributed to Renaissance Technologies' machine learning models from his IBM speech recognition background — and as co-CEO helped maintain the Medallion fund's performance — while becoming one of the most politically consequential investors of the 2010s through his funding activities.
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