The Ezra Klein Show
The Ezra Klein Show

The Simplest Way to Save Lives With Your Money

December 16, 2025

AI Summary

5 min read

🎙️ The Voices & The Context

  • The Format: This interview between host Ezra Klein and GiveWell CEO Ellie Hassenfeld dives into effective altruism through personal backstory, rigorous charity evaluation, and global health challenges, fostering an intellectual, evidence-driven tone focused on maximizing donor impact.
  • The Format: An in-depth interview blending memoir, analysis, and policy critique.
  • The Key Players:
    • Guest: Ellie Hassenfeld – Co-founder and CEO of GiveWell, a hedge fund alum turned philanthropy innovator who has directed over $2 billion in donations to high-impact charities via transparent, data-rigorous research.

🗝️ Key Themes & Topics

GiveWell's origin from hedge fund rigor to charity evaluation, the shift to global health priorities, challenges in measuring impact, and responses to U.S. foreign aid cuts dominate the conversation.

  • Topic 1: From Talmud to Hedge Funds to Philanthropy – Hassenfeld shares her unexpected path from studying ancient Jewish texts emphasizing epistemic humility, to Bridgewater's radical transparency culture, sparking a quest for evidence-based giving amid finance's high-stakes truth-seeking.
  • Topic 2: GiveWell's Evaluation Process and Top Charities – Detailed breakdown of how GiveWell vets charities using RCTs, cost-effectiveness models (e.g., cost per life saved), and track records, spo

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What you'll learn

  • 1 **(00:00) 🎙️ Introduction: Ellie Hassenfeld**
  • 2 **(03:09) Ellie's Early Path: Religion to Finance**
  • 3 **(04:54) Life at Bridgewater: Radical Transparency**
  • 4 **(10:21) Founding GiveWell: From Hedge Fund Giving to Full-Time Mission**
  • 5 **(11:44) Early Charity Research: Shocking Gaps**
  • 6 **(14:39) Barriers to Truth in Charity World**
  • 7 **(20:10) GiveWell's Launch: Incentives and Evidence**

+ Full timestamped outline available in the app

Show Notes

“This lightbulb went off that almost no one was asking these questions.”

In 2006, Elie Hassenfeld and a few of his friends pooled some money they wanted to donate to charity. And they wanted to find charities where their money would go the farthest in improving lives. That information, it turned out, was incredibly hard to find.

That was the seed of GiveWell. For almost a decade, GiveWell has dedicated itself to rigorously researching the impact of charities around the world and channeling donations to the ones that are the most effective at saving lives. It might sound simple, but this was a radically new approach in the world of charitable giving, and the work itself isn’t simple at all.

I’ve supported GiveWell through the years. So as the year winds down and other people might be thinking about giving to a charity, I wanted to invite Hassenfeld, GiveWell’s chief executive, on the show to talk through this work. How does it measure impact? Are there limits to what you can measure? As an organization, has it made mistakes? What does it really mean to give well?

If you like what you hear, I hope you’ll also consider donating to GiveWell. Learn more at givewell.org.

Mentioned:

GiveWell

“Trust in Radical Truth and Radical Transparency” by Ray Dalio

Harlem Children’s Zone

Against Malaria Foundation

Helen Keller Intl

New Incentives

No Lean Season

Clinton Health Access Initiative (CHAI)

PATH

GiveDirectly

ALIMA

Book Recommendations:

Factfulness by Hans Rosling with Ola Rosling and Anna Rosling Rönnlund

The Ezra Klein Show