GiveWell is well known for its rigorous evaluation process. Started in 2007 by Holden Karnofsky and Elie Hassenfeld, its mission is to help donors accomplish as much good as possible with their donations. The founders research and write on topics such as impact studies, evaluation of charities, donor education, microfinance, and health-related charities.givewell.org
San Francisco, CA, USA
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