Wikipedia - MacArthur Foundation

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Wikipedia·en.wikipedia.org/wiki/MacArthur_Foundation

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Good quality. Reputable source with community review or editorial standards, but less rigorous than peer-reviewed venues.

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Background reference on the MacArthur Foundation, useful for understanding the philanthropic landscape funding AI governance and policy work, though the foundation is not primarily focused on AI safety.

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Importance: 18/100wiki pagereference

Summary

Wikipedia overview of the John D. and Catherine T. MacArthur Foundation, a major philanthropic organization that funds a wide range of social, scientific, and policy initiatives. The foundation is relevant to AI safety through its support of nuclear security, technology policy, and responsible innovation programs. It is one of several large foundations influencing research agendas at the intersection of emerging technology and global risk.

Key Points

•MacArthur Foundation is a major US philanthropy with over $7 billion in assets, funding global and domestic programs.
•Supports work on nuclear security and technology policy areas that overlap with AI governance and existential risk concerns.
•Known for the 'genius grant' MacArthur Fellows Program, which has supported researchers across many fields including technology ethics.
•Has funded organizations working on responsible AI and technology governance as part of its broader mission areas.
•Relevant to understanding the philanthropic ecosystem that shapes AI safety and policy research funding.

Cited by 1 page

Page	Type	Quality
MacArthur Foundation	Organization	65.0

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# MacArthur Foundation

MacArthur Foundation

American private foundation

| [![](https://upload.wikimedia.org/wikipedia/commons/thumb/3/3a/MacArth_primary_logo_stacked.svg/500px-MacArth_primary_logo_stacked.svg.png)](https://en.wikipedia.org/wiki/File:MacArth_primary_logo_stacked.svg) |
| Founded | 1970;56years ago(1970)[\[1\]](https://en.wikipedia.org/wiki/MacArthur_Foundation#cite_note-AboutOurHistory-1)[\[2\]](https://en.wikipedia.org/wiki/MacArthur_Foundation#cite_note-2) |
| Type | [501(c)3 organization](https://en.wikipedia.org/wiki/501(c)3_organization "501(c)3 organization") |
| [Tax ID no.](https://en.wikipedia.org/wiki/Taxpayer_Identification_Number "Taxpayer Identification Number") | 23-7093598 |
| Focus | Climate change, nuclear challenges, non-profit journalism, local issues in Chicago |
| Location | - [Marquette Building](https://en.wikipedia.org/wiki/Marquette_Building_(Chicago) "Marquette Building (Chicago)"), Chicago, Illinois, U.S. |
| President | [John Palfrey](https://en.wikipedia.org/wiki/John_Palfrey "John Palfrey")[\[3\]](https://en.wikipedia.org/wiki/MacArthur_Foundation#cite_note-3) |
| Key people | [John D. MacArthur](https://en.wikipedia.org/wiki/John_D._MacArthur "John D. MacArthur") (co-founder) <br>[Catherine T. MacArthur](https://en.wikipedia.org/wiki/Catherine_T._MacArthur "Catherine T. MacArthur") (co-founder) |
| [Endowment](https://en.wikipedia.org/wiki/Financial_endowment "Financial endowment") | $9.2 billion (2024)[\[4\]](https://en.wikipedia.org/wiki/MacArthur_Foundation#cite_note-4) |
| Website | [www.macfound.org](https://www.macfound.org/)[![Edit this at Wikidata](https://upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png)](https://www.wikidata.org/wiki/Q1424691#P856 "Edit this at Wikidata") |

The John D. and Catherine T. MacArthur Foundation

The **John D. and Catherine T. MacArthur Foundation** is an American [private foundation](https://en.wikipedia.org/wiki/Private_foundation "Private foundation") that makes grants and [impact investments](https://en.wikipedia.org/wiki/Impact_investment "Impact investment") to support [non-profit organizations](https://en.wikipedia.org/wiki/Non-profit_organization "Non-profit organization") in approximately 117 countries around the world. As of 2025, the MacArthur Foundation has an endowment of $9 billion and provides hundreds of millions of dollars annually in grants and impact investments.[\[5\]](https://en.wikipedia.org/wiki/MacArthur_Foundation#cite_note-5)[\[6\]](https://en.wikipedia.org/wiki/MacArthur_Foundation#cite_note-6)[\[7\]](https://en.wikipedia.org/wiki/MacArthur_Foundation#cite_note-inside-7)[\[8\]](https://en.wikipedia.org/wiki/MacArthur_Foundation#cite_note-8) Based in [Chicago, Illinois](https://en.wikipedia.org/wiki/Chicago "Chicago"), it is one of the 20 largest private foundations in the United States.[\[9\]](https://en.wikipedia.org/wiki/MacArthur_Foundation#cite_note

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