Holden Karnofsky

Holden Karnofsky
Born1980 or 1981 (age 44–45)
EducationHarvard University (BA)
OccupationNonprofit executive
Known forCo-founding GiveWell and Open Philanthropy
Spouse
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(m. 2017)​

Holden G. Karnofsky (born 1980 or 1981) 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 (now called Coefficient Giving), and was its CEO and later co-CEO until 2023. He joined Anthropic in 2025.

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