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Jack Lewars

Karma: 2,842

Founder of Ultra Philanthropy, an independent advisory that helps major donors—increasingly from tech and AI—give for maximum impact; fund manager of its mid-stage global health fund; Chair of Trustees at High Impact Athletes.

GiveWell just an­nounced the biggest grant in its his­tory. Here’s what it means for your giv­ing.

Jack Lewars28 Aug 2026 16:01 UTC
24 points
0 comments6 min readEA link
(open.substack.com)

Donors should push an­i­mal welfare and global health char­i­ties to have more ro­bust scal­ing plans

Jack Lewars26 Aug 2026 16:47 UTC
22 points
1 comment8 min readEA link
(open.substack.com)

AI gov­er­nance work needs much bet­ter monitoring

Jack Lewars11 Aug 2026 17:39 UTC
17 points
4 comments8 min readEA link
(fundinganthropalypse.com)

Most donors get risk wrong

Jack Lewars4 Aug 2026 20:34 UTC
36 points
5 comments10 min readEA link
(open.substack.com)

Coeffi­cient Giv­ing just gave GiveWell $1 billion. Where should other donors give now?

Jack Lewars24 Jul 2026 15:37 UTC
41 points
5 comments2 min readEA link
(fundinganthropalypse.com)

Two Coeffi­cient Giv­ings beat one twice as big

Jack Lewars22 Jul 2026 13:26 UTC
41 points
5 comments11 min readEA link