Holden Karnofsky
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Holden Karnofsky

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Holden G. Karnofsky is an American nonprofit executive. Karnofsky co-founded the charity evaluator GiveWell with Elie Hassenfeld in 2007. He co-founded in 2014 the grantmaking organization Open Philanthropy, and was its CEO and later co-CEO until 2023. He joined Anthropic in 2025.

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Last updated
10 May 2026
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