Holden Karnofsky

Holden Karnofsky
EducationHarvard University (BA)
OccupationNonprofit executive
Known forCo-founding GiveWell and Open Philanthropy
Spouse
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(m. 2017)​

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

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