About Holden Karnofsky

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

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Born: July 1981

Facts from Wikidata (CC0). Image by Noah Berger/Open Philanthropy via Wikimedia Commons (CC BY-SA 4.0).

Holden Karnofsky

American nonprofit executive

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