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Alexander Berger
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Alexander Berger✓

@albrgr

Enjoys a good applied micro paper. CEO of @coeff_giving. Views my own, tweets self-destruct every once in a while.

  • San Francisco, CA
  • Joined
2.2K Following17.6K Followers2K Posts
  1. Alexander Berger✓@albrgr
    .@coeff_giving directed over $1b in 2025, the most in our history. I wrote a more personal annual letter this year, focusing on what a decade of grantmaking has taught me, how I'm thinking about AI, and how we're grappling with giving at this scale. 🧵
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    183926336.2K
  2. Alexander Berger✓@albrgr
    Alexander Berger
    RT @evavivalt: New working paper: Can AI forecast treatment effects in economics from pre-registration documents? Answer: Yes. 1/
    07206
  3. Alexander Berger✓@albrgr
    Alexander Berger
    RT @_NathanCalvin: I realize that Cathedral (the vulnerability researchers) didn't access Anthropic's weights or customer data, but there is no question that Anthropic has a ton of immensely sensitive information about model architecture research strategy etc in their Slack. Between this event and white hat researchers gaining access to OpenAI's mono-repo, the argument that we need to breakneck race to beat China looks more than a bit off when it seems like China will currently just be able to just take the fruits of research (and these small white hat teams are so much less capable than Chinese state backed hackers).
    will depue @willdepue
    fact check: even truer rumor is Cathedral got a lot of Slack, maybe all of research. what the fuck are we doing guys
    025027
  4. will depue✓@willdepue
    fact check: even truer rumor is Cathedral got a lot of Slack, maybe all of research. what the fuck are we doing guys
    211058876.3K
  5. Alexander Berger✓@albrgr
    Alexander Berger
    RT @alexolegimas: This is one of the most important pieces of social science on human and AI interaction that I’ve seen in some time. Experts follow agentic advice the vast majority of the time (causally), but only a tiny fraction credit the agent—majority think they came to decision on their own volition. Reminds me of the classic Nisbett and Wilson study on people following outside influence without realizing it “ But as more work is handed to AI—including AI safety research—these judgment calls are the main levers for people's own values to influence outcomes. If people defer to AI without noticing, then "human in the loop" might provide less assurance than people expect.”
    Alex Tamkin @AlexTamkin
    New Anthropic research: How AI agents shape experts' judgment calls When experts delegate work to an agent, do they still make the key decisions? We tested this in a randomized trial with 50 professional data analysts.
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  6. Alex Tamkin✓@AlexTamkin
    New Anthropic research: How AI agents shape experts' judgment calls When experts delegate work to an agent, do they still make the key decisions? We tested this in a randomized trial with 50 professional data analysts.
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    2835073.8K627K
  7. Alexander Berger✓@albrgr
    Alexander Berger
    RT @jordanschneider: save science take this job
    Director Michael Kratsios @mkratsios47
    .@NSF is hiring the inaugural Head of its Office of Metascience to apply the scientific method to how we fund, organize, and evaluate research. Continuous improvement will accelerate discovery. If you care about the science of science, apply:
    03023
  8. Director Michael Kratsios✓@mkratsios47
    .@NSF is hiring the inaugural Head of its Office of Metascience to apply the scientific method to how we fund, organize, and evaluate research. Continuous improvement will accelerate discovery. If you care about the science of science, apply:
    218436341.8K
  10. Alexander Berger✓@albrgr
    Alexander Berger
    RT @calebwatney: New Pacing the Frontier proposal: each time an outside group successfully penetrates the defenses of a frontier AI company and captures the flag, it should reset a 3-month countdown clock before they're allowed to train new models.
    Elizabeth Dwoskin @lizzadwoskin
    EXCLUSIVE: In less than 12 hours, a group of ex-DOGE cyber researchers were able to penetrate Anthropic’s systems using AI agents — including Slack channels where the most sensitive models are discussed. This is just weeks after Anthropic whistleblower Joseph Coxon charged the company w/launching “a hubristic gamble” from a “private company’s Slack.” Read our story here (gift link):
    029021
  11. Elizabeth Dwoskin✓@lizzadwoskin
    EXCLUSIVE: In less than 12 hours, a group of ex-DOGE cyber researchers were able to penetrate Anthropic’s systems using AI agents — including Slack channels where the most sensitive models are discussed. This is just weeks after Anthropic whistleblower Joseph Coxon charged the company w/launching “a hubristic gamble” from a “private company’s Slack.” Read our story here (gift link):
    823151.6K699K
  12. Alexander Berger✓@albrgr
    Alexander Berger
    RT @kurtislockhart: “Good urban planning is also a jobs policy” 🌆🌆
    World Bank Data @worldbankdata
    Cities can connect workers to more firms, occupations, and opportunities. But when housing and transport costs absorb the urban wage premium, density stops delivering on its promise. Good urban planning is also jobs policy: #WBGAtlas
    06027
  13. World Bank Data@worldbankdata
    Cities can connect workers to more firms, occupations, and opportunities. But when housing and transport costs absorb the urban wage premium, density stops delivering on its promise. Good urban planning is also jobs policy: #WBGAtlas
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    16231.9K
  14. Alexander Berger✓@albrgr
    Alexander Berger
    RT @DominicJPino: "If submitting a housing permit application on the same day, the average aspiring homeowner who wants to build in Miami, San Francisco or Boston — the cities with the longest permitting times — will still be stuck in paperwork when the average aspiring homeowner in Indianapolis, El Paso, Colorado Springs, Phoenix or Fort Worth is moving into a completed home." @PostOpinions
    030029
  15. Alexander Berger✓@albrgr
    Alexander Berger
    RT @annastansbury: The opportunity to migrate even temporarily/seasonally is *really good* for migrant workers and their families. Families of migrant workers see lower poverty, greater food security, invest in assets & reduce debts Paper by @melaniemorten @BMagaloni Cubillos & @AliceYiqianWang
    08027
  16. Alexander Berger✓@albrgr
    Alexander Berger
    RT @MilanV: New research by @AditiBhowmick18 et al finds that upward mobility in South Asia is higher in cities, with the urban mobility premium substantially higher for women than for men. Mechanisms are less patriarchal social norms and higher returns to education
    020030
  17. Alexander Berger✓@albrgr
    Alexander Berger
    RT @CSElmendorf: HUGE new Ct. of Appeal decision holds that CA homeowners whose ADU application was denied may sue city for damages. The logic sweeps broadly, probably reaching all housing projects subject to ministerial approval under state law -- and perhaps even more. 🧵/23
    031028
  18. Alexander Berger✓@albrgr
    Alexander Berger
    RT @Neil_Irwin: I spoke with @jasonfurman about his nifty new vibecoded econ site, but mainly about how AI tools have gotten way better at the work of economic research and analysis than I think many appreciate — with big implications for we humans who do that sort of work.
    038030
  20. Alexander Berger✓@albrgr
    Alexander Berger
    RT @jasonfurman: Why have interest rates risen? You can decompose into different components like real and nominal. Or expected rates and term structure. Not just for the United States but for the G7 economies.
    011023
  21. Alexander Berger✓@albrgr
    Alexander Berger
    RT @kimmaicutler: It could not be more stark, according to the data. You could have the hardest-working, most prodigious Congressional representative or the most obstructive. “Based on 84 votes she cast on land use since she joined the board in 2021, Chan was second only to former Board President Aaron Peskin in amassing a record consistently opposed to liberalizing housing regulation.” “From Wiener’s first session in the state Senate in 2017-2018 through the 2025-2026 session, he authored the most bills of any legislator in the chamber, at 186. Of those bills, 97 passed and were signed by the governor — the second-most over that period.”
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  22. Alexander Berger✓@albrgr
    Alexander Berger
    RT @otis_reid: Great round up of progress (and some setbacks in science funding and immigration) in abundance and growth from @mattsclancy: - BAAJA for energy permitting - SB79 into effect in CA, other bills passing in states - slow science spending - clinical trial experiments from ARPA-H
    03028
  24. Jason D. Clinton 🔸✓@JasonDClinton
    Posts @hinapansari
    @hinapansari yes. it was always going to be this way. we tried to warn the world.
    7021081.3K1.3M
  26. Alexander Berger✓@albrgr
    interesting thread
    Geoffrey Irving @geoffreyirving
    Lots of conversation around AI risks is about the gap between the unserious of AI labs' methods and how more rigorous industries work: airplanes, nuclear power, AI hardware. It would help a ton to lift AI to that level, but it is unclear even that level would be enough. 🧵
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  27. Geoffrey Irving✓@geoffreyirving
    Lots of conversation around AI risks is about the gap between the unserious of AI labs' methods and how more rigorous industries work: airplanes, nuclear power, AI hardware. It would help a ton to lift AI to that level, but it is unclear even that level would be enough. 🧵
    Download
    94128628.2K
  28. Alexander Berger✓@albrgr
    Alexander Berger
    RT @j_kalla: Now published at @apsrjournal. Check out "The Symbolic Politics of Housing"
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    Chris Elmendorf @CSElmendorf
    New results! In "The Symbolic Politics of Housing," @dbroockman @j_kalla & I showed that public opinion about housing policies correlates w/ affect towards the groups that the policies make salient (via framing or criteria in the policy itself). 🧵/19
    045029
  29. Chris Elmendorf@CSElmendorf
    New results! In "The Symbolic Politics of Housing," @dbroockman @j_kalla & I showed that public opinion about housing policies correlates w/ affect towards the groups that the policies make salient (via framing or criteria in the policy itself). 🧵/19
    Download
    52610331.3K
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