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Ari B Friedman

@abfriedman.com
7.1K followers 554 following 569 posts

This is my personal account. Faculty at UPenn. Emergency doc, health economist, geriatrics and privacy researcher. Views are my own. RT does not imply endorsement.

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Ari B Friedman @abfriedman.com · 28/09/2026
@pennldi.bsky.social covers our emerging research in the mechanisms of the harms caused by ED boarding of admitted patients. ldi.upenn.edu/our-work/res... Covers multiple articles and joint work with @kitdelgado.bsky.social, Alex Janke, Adrian Haimovich, and the entire resquenet.org collaboration.
ldi.upenn.edu
A Potentially Harmful ED Delay That Has Been Widely Overlooked
A new study co-authored by LDI Senior Fellow Ari Friedman, MD, PhD, and 36 other emergency medicine researchers, found that thousands of patients who had already been admitted to hospitals remained in...
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Ari B Friedman @abfriedman.com · 25/09/2026
Jack, you're a treasury of wisdom.
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Lilia Cervantes @cervantes-lily1.bsky.social · 24/09/2026
Out today in @jama.com: "On Becoming a Gold Standard Scientist: The Importance of Pilot Clinical Trials. I was honored to co-author this with Drs. Fesintein, @dramyhuebschmann.bsky.social & @russgl.bsky.social jamanetwork.com/journals/jam.... @jenna-m-norton.bsky.social @jeremymberg.bsky.social
jamanetwork.com
On Becoming a Gold Standard Scientist
This Viewpoint discusses the recent National Institutes of Health announcement that its Career Development (K) awards cannot be used to conduct clinical trials, feasibility studies, or ancillary studi...
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Ilya Kashnitsky @ikashnitsky.phd · 20/09/2026
One of the best examples of age heaping #demography Smth like this: - Who else lives in the household? - Grandpa - How old is he? - Ehm... 85
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ProPublica @propublica.org · 20/09/2026
ProPublica’s analysis of CDC data found that the rate of deaths involving ectopic pregnancies has nearly doubled. The spike alarmed many experts. One said it should “be a never event.”
propublica.org
Ectopic Pregnancy Deaths Have Nearly Doubled. It’s Worse in States With Abortion Bans.
With prompt and appropriate medical care, experts say, people shouldn’t die from an ectopic pregnancy. Women in Texas and Oklahoma have sued over delays in care, which, coupled with our new analysis, ...
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Ari B Friedman @abfriedman.com · 18/09/2026
In residency, I had the habit of looking at the timestamps on critically ill patients who were transferred from outlying community hospital EDs. I was frequently in awe of the emergency physicians there and the two ED nurses they typically would have at night, who in an hour or so could...
sciencedirect.com
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Jason Kint @kint.bsky.social · 17/09/2026
Eye popping. Court just unsealed Summary Judgment motions in New York Times v OpenAI / Microsoft. Easy to see why the AI companies had so many redactions (pink). Their own people wrote the lede for NYT, the "largest theft of labor in human history"... "more and more substitutive..." /1
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Tim Ellis, TDSB Ward 2 candidate 🍁 @djdynamic.ca · 26/05/2025
Absolutely surreal to have lived through the Napster days and watched as the titans of industry moved hell and high water to lock down any possible chance that someone's song might get swapped online without giving the studios a cut and now those same people are just like "well we gotta steal music"
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Politics_Oxford @politicsoxford.bsky.social · 17/09/2026
Oxford’s Centre for Democratic Resilience, in partnership with @buceriuslaw.bsky.social and @verfassungsblog.de, has launched the Higher Education and Democratic Resilience Programme. Find out more: www.politics.ox.ac.uk/higher-educat…
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Centre for Economic Performance @cep-lse.bsky.social · 17/09/2026
In a blog for LSE Business Review, Christian Krekel (CEP, LSE), Tim Kremser, and George Melios (LSE) find that far from getting used to working long hours, people feel worse the longer it lasts. blogs.lse.ac.uk/businessrevi...
blogs.lse.ac.uk
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27 UNIHTED @27unihted.bsky.social · 17/09/2026
Thank you to the plaintiffs, the staff at Protect Democracy, staff at ACLU, ACLU of Northern California, the Center for Science in the Public Interest, the Jacobson Lawyers Group, and all who supported this immense effort. protectdemocracy.org/work/researc...
protectdemocracy.org
Researchers challenge NIH screening of grants for disfavored viewpoints - Protect Democracy
Today, researchers filed a class action lawsuit challenging the National Institutes of Health’s (NIH) policy of blocking grants in order to censor views it disagrees with, on everything from DEI to ge...
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Philadelphia Inquirer @inquirer.com · 15/09/2026
The state has now reported four measles-related deaths amid a growing outbreak that has sickened nearly 700 people this year.
inquirer.com
Pennsylvania health officials confirm two new measles-associated deaths, bringing total to four as state outbreak grows
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Jo Wolff @jowolff.bsky.social · 14/09/2026
The fallacy that University leaders pushing AI are falling into is thinking that the point of undergraduate research is to find things out. It isn't. What students find out is typically already generally known. The point of undergraduate research is to learn how to find things out.
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Louise Matsakis @lmatsakis.bsky.social · 26/08/2026
Amazon is officially shutting down Mechanical Turk next month. It feels like the end of an era. I've written about the platform on and off for close to a decade. We wouldn't have the AI tools we do now if it weren't for the low-paid, largely invisible labor of MTurkers
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ABC News Australia @news.abc.net.au · 27/08/2026
Twenty years on from Gardasil vaccine launch, Australia on track to eliminate cervical cancer
abc.net.au
Australia on track to eliminate cervical cancer 20 years on from vaccine launch
Twenty years on from the launch of the world-first vaccine against cervical cancer, Australian Immunisation Register data shows HPV vaccine coverage for girls and girls is dropping.
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Mark Copelovitch @mcopelov.bsky.social · 26/08/2026
Science is awesome. We should fund it.
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Pew Research Center @pewresearch.org · 26/08/2026
Is AI being used in your healthcare? 🤖 🩺 Our new survey asked Americans about their views on #AI at the doctor’s office. We found that they’re uncertain about whether it’s used in their healthcare, and they want to be informed if it is.
Chart showing most Americans say it’s highly important that their healthcare provider tells them if they are using AI.
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Kathleen Bachynski @bachynski.bsky.social · 26/08/2026
“Half a million dollars. That’s about how much it cost several public health agencies to contain one small measles outbreak… Though it was a relatively modest cluster — a total of 10 cases involving nine children & one adult — it nevertheless consumed 6,785 hours of labor by state & local workers”
washingtonpost.com
Fighting measles is expensive. See what it cost to contain 10 cases.
A week-by-week breakdown of why the public health response to outbreaks is so costly.
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Seth Trueger @mdaware.org · 26/08/2026
we all have mental rolodexes of patients we never forget as an ER doc, I've taken care of quite a few patients where we found new -- almost always advanced -- pancreatic cancer this is great news and a nice reminder of why we all chip in and hire the best scientists to find new & better tools
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Ari B Friedman @abfriedman.com · 24/08/2026
Today 1pm EST: Dr. Maya Yiadom (Stanford EM) shares her expertise on Considering Equity in Clinical A.I. Validation. Real-world emergency examples show how differences affect model performance. www.coretalks.org Register here (free Zoom seminar): pennmedicine.zoom.us/meeting/regi...
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Ari B Friedman @abfriedman.com · 24/08/2026
So many things in healthcare and policy are like this chicken coop: surely it can't matter if the siding ends an inch too high? Yet the details matter in the long run, and that missing inch of siding costs an entire coop years later.
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NEJM.org @nejm.org · 15/08/2026
In a new NEJM Voices blog post, @iwashyna.bsky.social explains why physicians should make targeted, moderate-scale philanthropy a core task in their career development and why doing so is particularly urgent and valuable now. Learn more and sign up for email alerts: nej.md/3UzTlBt
A quote from an NEJM Voices blog post reads as follows: “If our institutions of higher learning can make it easy for a new class of physician patrons to donate and for the most promising young scientists to receive and thereby resuscitate their threatened careers, we may be able to stave off the catastrophic discovery gap and scientific workforce gap that we currently risk.” The author is "Theodore Iwashyna, M.D." The background color is purple and includes the NEJM Voices logo.
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Andrea Mann @andreamann.bsky.social · 19/08/2026
"By writing, you are literally firing up your brain and therefore stirring up your conscious thoughts and something new emerges. You are not, or at least not always, transcribing something already present in your conscious thoughts.“ LOVE this piece. www.historians.org/perspectives...
historians.org
How Writing Leads to Thinking (and Not the Other Way Around) – AHA
Writing is stressful. Sitting in my computer chair my neck and shoulder muscles almost immediately tense up as I dig around in my brain for the best phrase or even any coherent string of words.
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Lauren Southerland @lsgeriatricem.bsky.social · 17/08/2026
Great to see this article highlighting the problems faced by patients in the hospital! Thanks @abfriedman.com and coauthors!
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PennLDI @pennldi.bsky.social · 17/08/2026
Does postpartum visit attendance vary by birth timing? LDI/CHOP experts found that people with preterm or late/postterm births were more likely to miss postpartum visits than those with full-term births. Risk was highest after periviable births (22–23 weeks). bit.ly/4hyOzhf
bit.ly
OBGYN
Introduction Approximately 40% of obstetric patients do not attend a postpartum visit. Postpartum parents of preterm infants (<37 weeks) are often sicker than parents of full-term infants. Nonethele...
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Jack Iwashyna @iwashyna.bsky.social · 17/08/2026
Some hospitals get inpatients to their inpatient teams fast Some... do not new in @jama.com by @abfriedman.com and an amazing team of folks jamanetwork.com/journals/jam...
plot showing there are some hospitals where 10-20% of patients routinely have more than 24 hours after admission decision from the ED before an inpatient team starts writing orders
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Population Aging Research Center @pennaging.bsky.social · 17/08/2026
🧠 The Role of AI in Dementia Care PARC Research Associate Jason Karlawish explores its promise but urges caution in @statnews.com www.statnews.com/2026/07/08/dementi… ldi.upenn.edu/our-work/research-upd…
statnews.com
What's the right role for AI in dementia care?
Three tricky questions about using AI in dementia care.
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Ari B Friedman @abfriedman.com · 17/08/2026
Proud to announce the inaugural effort of RESQUE-Net (Research in Emergency Systems and Quality Using EHRs Network), led by Alex Janke, Adrian Haimovich, and myself, but with contributions from 17 health systems and 56 hospitals across the country. jamanetwork.com/journals/jam...
jamanetwork.com
Time to Inpatient Management for Boarding Emergency Department Patients
This study examines the patient- and hospital-level variation in time to initiation of inpatient management among patients admitted to general medical services.
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Carl T. Bergstrom @carlbergstrom.com · 17/08/2026
7. It's yet another thing that AI has stolen away from the current generation of scientists. Yet again, AI proves to be an anti-egalitarian force in that these abuses force us to abandon the Mertonian norm of universalism for increased reliance on credentials, reputation, and personal connections.
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Carl T. Bergstrom @carlbergstrom.com · 17/08/2026
6. When I was 24 years old, I wrote a long letter to my academic hero, John Maynard Smith, asking him for comments on a paper I'd written about one of his models. He had never heard of me but my missive launched a (pen-and-paper) correspondence that ran hundreds of pages and lasted until his death.
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Carl T. Bergstrom @carlbergstrom.com · 17/08/2026
4. These emails violate that compact — and the consequences that they force me to stop doing something that I’ve always done for my colleagues. If someone I’ve never met writes me a long letter, asks me to look at their work, and it’s actually relevant, I do. But not anymore.
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Carl T. Bergstrom @carlbergstrom.com · 17/08/2026
3. I find this a profoundly cynical thing to do. The academic community relies on norms that enable productive interaction among community members, even if they have not met previously. It has always been the case that I can assume that a fellow academic contacts me is doing so in good faith.
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Carl T. Bergstrom @carlbergstrom.com · 17/08/2026
2. I guess this is the new form of academic engagement farming. Spin up some agents to search for relevant targets and then write each of them a letter, custom tailored to what the target has published, about whatever you’re trying to promote.
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Carl T. Bergstrom @carlbergstrom.com · 17/08/2026
1. Recently I’ve received lots of emails from people I don’t know personally, asking for my feedback on their books or papers. They explain the connection between my work and theirs and ask me to take a look. The catch, of course, is that the emails are transparently, obviously, written by AI.
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NBC News @nbcnews.com · 16/08/2026
Because of global cuts to foreign aid, the Gates Foundation has predicted that 2025 will be the first year this century where child deaths will increase.
nbcnews.to
USAID fallout: In Nepal, when the aid workers stopped coming, the women and babies started dying
The U.S. government has repeatedly insisted that no one — and, particularly, no children — have died because of its funding cuts. But the AP has documented the deaths of women and children from Myanmar to Nigeria.
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Ari B Friedman @abfriedman.com · 14/08/2026
PSA: If you've never worked through the math of bonds (duration and its many meanings, convexity, etc.), you should some time! Some really beautiful emergent properties from some very "simple" entities. Fabozzi et al has some nice classic handbooks that are good.
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Atheendar Venkataramani @atheendar.bsky.social · 28/05/2026
1/ New #paper by Chuck Manski, @johnmullahy.bsky.social, and me in the Journal of Business and Economic Statistics (@amstatnews.bsky.social).
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Philip N Cohen @philipncohen.com · 12/03/2026
America will continue punching itself in the face until morale improves.
chronicle.com
The Drop in International Students Last Year Was Worse Than We Thought
Visa issuances nosedived 36 percent, possibly reflecting weakening global interest in studying in the United States.
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Ari B Friedman @abfriedman.com · 06/08/2026
Policy is complicated but it's not *that* complicted. 1. Start with who you want to help and why. 2. Figure out the most efficient way to get there, subject to constraints, unintended consequences as people respond to incentives, past experiences/research.
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Merriam-Webster @merriam-webster.com · 05/08/2026
Jane Austen used 'however' at the beginning of a sentence, and so can you.
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Ari B Friedman @abfriedman.com · 04/08/2026
Doing policy right for an entire country even in one domain is really hard.
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Bree (half of Kit Rocha) @mostlybree.kitrocha.com · 04/08/2026
I'm just gonna say: it somewhat baffles me that people who are understandably skeptical of opaque LLMs as legitimate sources of information will suddenly go full on "the computer KNOWS" when they are using opaque tools to "detect" AI. The computer does not know.
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PennLDI @pennldi.bsky.social · 31/07/2026
How could the expiration of enhanced ACA Marketplace subsidies affect families? LDI's Betsy Salazar & colleagues conducted a simulation, and found that premiums could rise to 15% of total income for some middle-income families. Salazar discusses this finding in a new Q&A: bit.ly/4bHPd8z
bit.ly
Why Some Family Health Insurance Is Now Pricier
LDI/CHOP experts estimated the potential effect of the expiration of enhanced ACA Marketplace subsidies on family premiums across income levels.
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Ari B Friedman @abfriedman.com · 31/07/2026
Parallels to medical malpractice are strong here: pick one conceptualization. If LLM is an algorithm, then the corporation is responsible. If the algorithm is an “intelligence,” “a colleague,” a licensed “practitioner,” or has a corporate title, then an employee of these corporations hacked rivals.
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Eileen Clancy 🧿 @clancyny.bsky.social · 31/07/2026
Ameaka Fatima Nkempu, a Johns Hopkins University researcher in public health, was detained by ICE while boarding a domestic flight. She says she is Cameroonian in a Medium article that she authored. As of Thursday morning, the ICE Online Detainee Locator did not list where she was being held.
Studio photo of a Black African women wearing a beautiful dress in a printed fabric.

Caption:
Ameaka Fatima Nkempu, Johns Hopkins public health
researcher, was detained by immigration agents while
boarding a domestic flight this week. (Johns Hopkins
University)
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John Burn-Murdoch @jburnmurdoch.ft.com · 31/07/2026
Yep, elements of all of those are visible in the data. US median wealth dipping much more deeply during the GFC was in part because the median American has much higher exposure to equities than the median European.
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Jeremy Berg @jeremymberg.bsky.social · 31/07/2026
My quote of the day I consider myself a perpetual student. You seek and learn every day: from an experiment in the lab, from reading a scientific journal, from taking care of a patient. Because of this, I rarely get bored. Anthony Fauci
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Ari B Friedman @abfriedman.com · 31/07/2026
The Effects of Mandatory Profit-Sharing on Workers and Firms: Evidence from France QJE Elio Nimier-David , David Sraer , David Thesmar academic.oup.com/qje/article/...
academic.oup.com
The Effects of Mandatory Profit-Sharing on Workers and Firms: Evidence from France
Abstract. Since 1967, all French firms with more than 100 employees have been required to share a fraction of their excess profits with their employees. Th
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Peter Tennant @pwgtennant.bsky.social · 31/07/2026
Possibly the greatest work of satire I've ever seen. Thank you @theonion.com.
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Tracy O’Connell Novick @tracynovick.bsky.social · 30/07/2026
This is very, very interesting.
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