PIAS Lab @PIASLab
Public Impact Analytics Science Lab at @Harvard 📈 Advancing and applying analytics for solving societal problems with public impact | Director @Soroush_Saghaf piaslab.hks.harvard.edu Harvard University Joined April 2022-
Tweets484
-
Followers311
-
Following230
-
Likes568
.@PIASLab director, @Soroush_Saghaf, recently lead a workshop on artificial intelligence, machine learning, and their implications for public policy Thank you to everyone who participated!
🚨 New research: Can LLMs be used for 𝐬𝐞𝐪𝐮𝐞𝐧𝐭𝐢𝐚𝐥 𝐝𝐞𝐜𝐢𝐬𝐢𝐨𝐧-𝐦𝐚𝐤𝐢𝐧𝐠 in complex, ambiguous environments? Our new paper — Large Language Models for Sequential Decision-Making: Improving In-Context Learning via Supervised Fine-Tuning — shows the answer is yes, and the gains are substantial. Most AI decision-making research assumes the world is fully observable and unambiguous. Real-world problems — especially in domains such as healthcare — are neither. Our framework fine-tunes a pretrained LLM (Llama-2-7B) on offline, oracle-labeled trajectories so it can tackle MDPs, POMDPs, and Ambiguous POMDPS (APOMDPs): settings with partial observability and model ambiguity. 💡 Key findings: → SFT slashes the optimality gap from 43% → 15% vs. random baselines in long-horizon MDPs → In partially observed and ambiguous environments, fine-tuned LLMs outperform ICL-only baselines and DPT by up to 15 percentage points → On the Darkroom navigation task, our model achieves ~95% of oracle performance → Robust to out-of-distribution conditions — strong generalization without retraining 📐 On the theory side, we interpret the fine-tuned attention mechanism as implicitly estimating optimal Q-functions, and derive an end-to-end suboptimality bound that cleanly separates in-context estimation error from training-length bias. This matters deeply for use in areas such as healthcare, where experimentation is costly or unethical and offline observational data are abundant. Our goal: give clinicians AI systems that reason under genuine uncertainty — not just clean textbook settings. Huge congratulations to my current and former lab members Minmin Zhang and @aghaei_sina on this work! 📄 Read the paper: arxiv.org/abs/2605.09009 #ArtificialIntelligence #MachineLearning #LLM #ReinforcementLearning #Healthcare #DecisionMaking #Research #Sequential
How can we make #AI impactful in #healthcare? Looking forward to this event hosted by @UICmedicine where I will be sharing some thoughts and answers.
Join @PIASLab director, @Soroush_Saghaf, for the May Virtual Seminar hosted by @UICmedicine AI.Health4All Making Al Impactful in Healthcare 📅 May 20, 2026 🕒 3–4 PM ET medicine.uic.edu/events/ai-heal…
Will you be at the Annual @POM_Society Conference? @PIASLab member @JacobCJameson will be presenting his JMP with @Soroush_Saghaf on image batching in EDs 🩻🏥
Excited to present my *job market paper* at the Annual @POM_Society Conference 2026 this Sunday morning! “The Impact of Batching Advanced Imaging Tests in Emergency Departments” Joint work w/ @Soroush_Saghaf, @robert_huckman, @nhodgsonem, and Joshua Baugh. 1/n🧵
Join @PIASLab director, @Soroush_Saghaf, for the May Virtual Seminar hosted by @UICmedicine AI.Health4All Making Al Impactful in Healthcare 📅 May 20, 2026 🕒 3–4 PM ET medicine.uic.edu/events/ai-heal…
Work by @Mohammad_Zhale & @Soroush_Saghaf (@PIASLab) will be at @nberpubs AI in Healthcare conference (May 7–8, Cambridge) "Harmonizing Safety & Speed: A Human-Algorithm Approach to FDA Device Clearance" nber.org/conferences/ap…
“Let’s talk about data”📊 #Analytics #Sience (including #AI as one of its many branches) can help you improve the world and solve real-world problems. If you are interested, check out this short video and the book (Amazon: a.co/d/01AGVvdZ). 📺📺: youtube.com/shorts/MU9MS-W…
AI in healthcare needs to move beyond prediction → decision-making. @Soroush_Saghaf will share how causal AI + “centaur” models (human + algorithm) can improve clinical care at the CPA Speaker Series @UAlbertaBiz. 📅 Apr 10, 2026 🕙 10–11:30 AM 📍 BUS 4-06
I’m very proud of my fantastic PhD student @JacobCJameson! Congratulations!
Congratulations to lab member @JacobCJameson for winning the People's Choice Award🏅for poster presentation at the IOE-ISyE-MS&E Rising Stars Workshop! 👏 @umichioe @GeorgiaTechISyE @StanfordEng
Congratulations to lab member @JacobCJameson for winning the People's Choice Award🏅for poster presentation at the IOE-ISyE-MS&E Rising Stars Workshop! 👏 @umichioe @GeorgiaTechISyE @StanfordEng
I’m grateful for this exciting collaboration with @awscloud and @DanaFarber. @HarvardBizGov @harvard_data
🎥 New from @PIASLab & @harvard_data Designing a Multi-Modal LLM for Personalized Patient Care (@Soroush_Saghaf) This work explores how AI can move beyond prediction to support causal reasoning in clinical decision-making youtu.be/yutzdT6WtTQ?si…
🎥 New from @PIASLab & @harvard_data Designing a Multi-Modal LLM for Personalized Patient Care (@Soroush_Saghaf) This work explores how AI can move beyond prediction to support causal reasoning in clinical decision-making youtu.be/yutzdT6WtTQ?si…
Coming up on Friday, get ready for the student-led AI Symposium at Harvard Kennedy School. Leaders from government, industry, and academia will gather to explore the future of #AI policy, governance, and innovation. Discover more here - hks-ai-symposium.com/#home
Did you know that @Arnold_Ventures has a standing RFP for causal research proposals related to crime and the criminal justice system? Send us your ideas! We aim to get you an answer fast (within 3 months). All we need from you is a 3-page LOI that describes the intervention you're testing and the research design you're using. (Link below.)
My thoughts on enhancing the impact of #healthcare #AI 👇
@HarvardBizGov affiliate @Soroush_Saghaf (@PIASLab) is a part of this recent SAN article that explores how #AI is revolutionizing health care in the U.S., but also asks can regulations keep pace to ensure better patient outcomes? Read more here - san.com/cc/move-fast-a…
Glad to see our research being used in a U.S. Supreme Court filing in U.S. Food and Drug Administration v. Alliance for Hippocratic Medicine. 👇 @HarvardBizGov
Research from the @PIASLab is cited in @USSupremeCourt brief in @US_FDA v. Alliance for Hippocratic Medicine. The filing references work by @Soroush_Saghaf et al. (2022) on hospital closures and health system capacity. reproductiverights.org/wp-content/upl… Paper: link.springer.com/article/10.100…
@HarvardBizGov affiliate @Soroush_Saghaf (@PIASLab) is a part of this recent SAN article that explores how #AI is revolutionizing health care in the U.S., but also asks can regulations keep pace to ensure better patient outcomes? Read more here - san.com/cc/move-fast-a…
Research from the @PIASLab is cited in @USSupremeCourt brief in @US_FDA v. Alliance for Hippocratic Medicine. The filing references work by @Soroush_Saghaf et al. (2022) on hospital closures and health system capacity. reproductiverights.org/wp-content/upl… Paper: link.springer.com/article/10.100…
New research from @alexgazmararian, @NateMJensen & @HarvardBizGov Affiliate @DustinTingley shows that while people near new clean energy projects notice the investments, they tend to credit state governors over the White House. Learn more about how political messaging shapes public perception of federal #climate actions: pubmed.ncbi.nlm.nih.gov/41746724/
Yixuan Long @AlbertL65716308
6 Followers 41 Following Graduate student in Operations Research at Georgia Institute of Technology @Pitt_IE alum.
Auyon Siddiq @auyonomous
232 Followers 404 Following Associate Professor @UCLAAnderson. Markets, competition, AI. @UCBerkeley PhD; secretly Canadian.
Edú Ortega-Ibarra @EduOrtegaIbarra
34K Followers 27K Following Mexican professor-researcher | Nutritionist | Political scientist and public manager in training | Public policy, governance, food security, and nutrition.
Edema Fred Otto @EdemafredOtto
2K Followers 8K Following MBChB || MPH - Candidate|| President @UYCAS256 || CEO @WNHealthForum Passionate About Health | Climate | Youth Empowerment
Dean Moazen, MD,FACS @dean_moazen
765 Followers 1K Following General Thoracic Surgeon, Former PostDoc Fellow at Massachusetts General Hospital, Harvard Medical School
sps @psmd446629
58 Followers 7K Following Interest: Polity | history | economy | tech | public policy | env | geography | ethics | society | governance | agri | biotec | space | def | health| IR | AI |
AI in Medicine Confer... @AIinMedicine27
115 Followers 1K Following AI in Medicine Conference June 03-04, 2027 | Amsterdam, Netherlands #AI #Roboticsurgery #Precisionmedicine #Medicalimaging #Diagnostics #Radiology
Ado Argüello @adolfoarguellov
1K Followers 4K Following Chiapaneco @NYUSternEMBA; ExBoard member @Acevalmx; @HKSExecEd LEG LGG IPP Practitioner @HarvardBSC; @GeorgetownLatAm @IPDET @IDEASEval @CheveningFCDO #GpRD
Rizky Luthfianto @luthfian_to
259 Followers 490 Following interested in Data Science, Optimization #orms, Regression, and Network Design
Demetri @DemetriTheGreat
122 Followers 539 Following
Wanjũhĩ @iwanjuhi
2K Followers 812 Following Working at the intersection of Behavioral Science, #AI, #Data & #EmergingTech Policy|(@wef)| MIT–Harvard ’26| @harvardcpl Fellow | #Kenyan 🇰🇪
Ramin Talebi Khameneh @raminkhameneh
5 Followers 42 Following PhD Candidate in Systems Engineering at Stevens Institute of Technology
HannahPeg @i8IlOi1Wahe5d
28 Followers 2K Following
; @IPENBEVCOI
0 Followers 3K Following
PrincessIsabellaClark @Imouape9015
21 Followers 2K Following Powerful and unstoppable Coffee and confidence
Xinyue Wen @XinyueWen_
0 Followers 40 Following Graduate Student at #Middlebury | Peacebuilding Fellow | Intern at #UNDP #UNEP | RUC alu | Researching Spatial Inequality, Public Health & Aging
Dr. Abdul Qayoom Soho... @qayoomsohoo
2K Followers 6K Following Alumni #UMass | #IIUI | #NDU | #AIOU | #SALU |#NUML | #USindh. #Politics | #IR. US Foreign Policy | Politics of South Asia | Comparative Poli.
Xie Ziang @angzi0520
1 Followers 45 Following
Kazim Haidari @kazimhaidari009
137 Followers 3K Following AI & Data Science @ Entrepreneur &Scientist; focused on AGI. I'm curious to understand the universe and what's insight into our brains.
Michael V. Warson @vaillante14
231 Followers 4K Following
Jingyun Su @JoanSu6585
0 Followers 7 Following
posqpanrhusuwhd @PQdiving
0 Followers 224 Following
Raúl Duarte Gonzále... @rduartegonzalez
1K Followers 2K Following Ph.D. in Political Economy & Government @Harvard & @Kennedy_School. From 🇵🇾 https://t.co/fNFH6mCYGB
Christian S. OTCHIA @christianotchia
1K Followers 2K Following Faculty @NagoyaUniv|Economist|1st Thomas Rutherford & 2016 Lawrence R. Klein Awards Winner|From Kinshasa
Zhaowei She @zpipposhe
171 Followers 966 Following Assistant Professor in Operations Management @sgSMU
anqi @avenus_yu
12 Followers 239 Following
Manish M. @manishm
35K Followers 810 Following AI × Monetization × Global growth @stripe | Ex @twitter, @flipkart, @intuit | @wharton MBA, @harvard MPA
Haneen Kadi @HaneenKadi
0 Followers 984 Following Medical student, a cinephile at heart (#FilmNoir); aspiring filmmaker; photographer.
Giuseppe Tarantino @Peppe_T91
339 Followers 869 Following Instructor in Medicine at @DanaFarber @harvardmed @broadinstitute | PhD in Oncology at University of Bologna | visiting scientist @wharton
Minh Nguyen @MinhNgu39814872
32 Followers 489 Following Assistant Professor, Florida Atlantic University
Sadiq Baloch @Sadiq_Baloch88
796 Followers 2K Following PhD | Proud Baloch | Traveled to 24+ countries | Postdoc @ University of Malta | “Believe you can, and you’re halfway there.”
Aaron Yongtae Kwon @YongtaeKwon
284 Followers 2K Following PhD in Public Policy @UTAustin @TheLBJSchool || BA, MA @SeoulNatlUni || Environmental and Energy Economics, Environmental Justice || 🇰🇷
Soledad Giardili @RueMartel
664 Followers 1K Following Assistant Professor @econedinburgh. Research on Labor, Education, Gender and Health. Affiliate @iza_bonn, @CESifoGroup.
Tong Liu @_TongLiu_
22 Followers 94 Following PhD student in Civil Engineering at Clemson University
Dr. Nazanin Andalibi @naz_andalibi
6K Followers 2K Following Asst Prof @umsi (she/her) | find me on the other place, no longer here | 🐕🦺mom | posts don’t represent employer
Roya @RoyaMsadegh
146 Followers 363 Following Interested in decision-making, our uncertain world, and our new collaborator, AI ! 👩🏻💻🧠🌌 MA in cognitive science@Tmu Ph.D. Student at @UMass
Dara @dara_tourt
11 Followers 8K Following
Seyed Mohammad Hossei... @semohhosseini
15 Followers 575 Following
Gumby @Ygu_i_mogtblzs
10 Followers 267 Following
Manish M. @manishm
35K Followers 810 Following AI × Monetization × Global growth @stripe | Ex @twitter, @flipkart, @intuit | @wharton MBA, @harvard MPA
Mariam Krikorian Atki... @MariamKA_1
51 Followers 157 Following Using management science to help people work better together. Expertise in healthcare delivery. Professor @harvard.
Paula Rodríguez Día... @paularodrid
1K Followers 1K Following PhD Candidate in Computer Science @Harvard · Co-organizer @capp_lac · Previously: @quantilma @uniandes · Colombiana 🇨🇴
Maria Andreina Cantel... @MariandreC
485 Followers 1K Following Economista @Unimet Gerencia Pública @IESA. MPA/ID @Kennedy_School Mi deporte favorito es conocer ciudades corriendo
Bharti Khurana, MD, M... @KhuranaBharti
3K Followers 552 Following Founder @HarvardTIRIC @BrighamWomens Assoc. Prof @harvardmed |Author #CoffeeERAD| Dir #HarvardERCME| Sec Editor @UptoDate| Scholar @theNAMedicine|@MITSloan alum
Gizem S. Nemutlu @GizemNemutlu
132 Followers 298 Following Assistant Professor of Data Analytics @BrandeisBiz | Former PostDoc @mgh_ita & @harvardmed | PhD @UWaterloo
Brian Denton @bridenton
621 Followers 430 Following Professor, Department Chair, Dog Lover, Fly Fisherman
U-M Industrial and Op... @umichioe
2K Followers 320 Following #2 industrial engineering grad program #5 industrial engineering undergrad program
Connor Lawless @LawlessOpt
107 Followers 180 Following he/him 🌈 Stanford MS&E Postdoc | Human-Centered AI & OR Prev: @CornellORIE @MSFTResearch, @IBMResearch, @uoftmie
Hossein Hejazian @HosseinHejazian
47 Followers 85 Following Postdoctoral Research Fellow at @Harvard; Ph.D. in Operations Management; Causal Inference, AI/ML in Healthcare Analytics/Operations
Sina Aghaei @aghaei_sina
246 Followers 446 Following Postdoctoral Fellow at Harvard @Kennedy_School, PhD from @USC.
Nicole Hodgson MD @nhodgsonem
152 Followers 211 Following Emergency Medicine Physician | @ArizonaACEP Past President | Vice Chair EM #MayoClinicAZ | all opinions expressed are my own
Mary Beth Landrum @Mblandrum
241 Followers 461 Following
Sidian Lin @SidianL
22 Followers 47 Following PhD student @Harvard @PIASLab | #Healthcare | #MachineLearning | #OperationsResearch
John Giardina @jc_giardina
201 Followers 239 Following Associate Investigator @mgh_mpec | Previously @Harvard and @decisionscience
Ekta Singh (she/her) @Msektateacher
926 Followers 2K Following professor. mom. life-long learner. Sikh. human rights/equity advocate. settler. anti-racist. researcher. health equity. ally. tweets are mine.
Dr. Jason Vassy @jasonvassy
7K Followers 2K Following Primary care physician and genomic medicine researcher @VABostonHC | Assoc Prof @HarvardMed | @BrighamWomens | @Genomes2People
Nolan M. Kavanagh @nolankavanagh
733 Followers 1K Following I study health, policy, and politics • Emergency medicine resident at @bidmchealth / @harvardmed • MD, PhD, MPH • 🏳️🌈 • he/him/his
Madison Coots @madisoncoots
228 Followers 85 Following Public Policy PhD Student @Harvard 📚 | @Stanford CS Alum 👩🏻💻 | Plant Hobbyist 🌱 | Interested in using data science to design policy and drive reform
Baris Tezcan @tezcan_baris
149 Followers 402 Following Optimization @corteva | PhD in Industrial Engineering @ORSJ_Lab @northeastern
Fausto Pedro Garcia M... @faustospain
15K Followers 12K Following Full Professor at @ingenium_rg @uclm_es @Spain,SM at @IEEEorg #ArtificialIntelligence #AI #DataScience #Analytics #RenewableEnergy #Maintenance #Management #IoT
Hadley Stevens Smith @hadleyssmith
724 Followers 2K Following Health economist & ELSI scholar researching pediatric genomic medicine. Assistant Professor of Population Medicine @CHERP_DPM @PROMoTeR_DPM. @GenetxValue
Rakesh Allu @Rakeshallu18
123 Followers 358 Following Digital Platforms & Social sustainability. OM PhD @Cornell. Formerly data scientist at Deloitte & HSBC. PGP #ISB
NEJM AI @NEJM_AI
13K Followers 328 Following NEJM AI is a new journal on medical artificial intelligence and machine learning from NEJM Group, the publisher of @NEJM.
Giuseppe Cavaliere @CavaliereGiu
30K Followers 413 Following Professor of #Econometrics @Unibo & @UniofExeter. Co-Editor of @JEconometrics. Dadx2. Tireless traveler.
Elena Llaudet @ellaudet
10K Followers 7K Following Political Scientist | Associate Professor @Suffolk_U | Harvard PhD | Co-author of Data Analysis for Social Science (with Kosuke Imai)
Pranav Rajpurkar @pranavrajpurkar
27K Followers 799 Following Co-Founder a2z Radiology AI https://t.co/mdi996SFZy | Assistant Professor Harvard Lab: https://t.co/Z6tBGoluEG
Laura Wherry @LaurawherryR
4K Followers 3K Following assoc prof of econ & public service @NYUWagner, previously @UCLA_GIMHSR and @RWJF postdoc @umichsph, @HarrisPolicy grad
Amitabh Chandra @amitabhchandra2
17K Followers 580 Following Economist and Professor at HBS and HKS @Harvard. Tweets about food, dogs, piano, affogatos, India, and occasionally, health care.
Harvard Health Policy... @HarvardHPM
8K Followers 1K Following The Department of Health Policy and Management (HPM) at @HarvardChanSPH. @ https://t.co/wuIadoBifw on BlueSky.
Becca Willett @WillettBecca
2K Followers 955 Following Professor of Computer Science and Statistics at the University of Chicago
Joshua Salomon @jsalo... @SalomonJA
3K Followers 1K Following Professor at Stanford. Probabilistic optimist. Infectious disease | decision science | simulation modeling | economic evaluation | health policy
Irene Chen @irenetrampoline
9K Followers 974 Following ML for healthcare and equity. Assistant Professor @UCBerkeley and @UCSF. Prev @Harvard, @MIT, @MSFTResearch
R Medicine @r_medicine
3K Followers 1K Following
Joe Blitzstein @stat110
17K Followers 5K Following Statistics professor at Harvard; statistician and data scientist; probability and paradoxes; Bayesian frequentist reconciliation; chess.
Jag Chhatwal @JagChhatwal
764 Followers 631 Following Director at Mass General @mgh_ita | Associate Prof @harvardmed and @decisionscience. Disease modeling | AI | addiction | liver | meditation
DARTH workgroup @DARTHworkgroup
697 Followers 201 Following The DARTH workgroup is comprised of researchers who have a passion for transparent and open-source #rstats -based solutions to decision analysis in health
Medical Decision Maki... @MedDecMak
1K Followers 24 Following Medical Decision Making is published 8x per year - To improve public health and clinical care, MDM offers rigorous, systematic approaches to decision making.
Harold Pollack @haroldpollack
26K Followers 3K Following University of Chicago prof. RT not endorsements. Index card book https://t.co/1mnXctoiej https://t.co/taVCo3uEvm Always pay your full credit card bill...
Mu'az Muhammad @Muaz4change
3K Followers 2K Following Making health products available through #MarketShaping. @FuturesCoLab #OxygenCoLab. Ex @results4dev, @JohnsHopkinsCCP & @JSIHealth. Alum of @ColumbiaSIPA.
Alex Schubert @alexmschubert
36 Followers 221 Following PhD Student in Computational Precision Health at @UCBerkeley
Davene R. Wright, PhD @WrightCensored
2K Followers 2K Following no longer active here, find me on 🦋 | Associate Professor @DeptPopMed | opinions are my own
Koch Institute at MIT @kochinstitute
46K Followers 1K Following The Koch Institute brings interdisciplinary approaches together to advance the fight against cancer. More places to follow us: https://t.co/fPPRkN0PSj
Signal 1 @Signal1_AI
180 Followers 23 Following Transforming hospital care with AI. Clinically Validated. Responsibly deployed.
US Healthcare Informa... @InformaticsUs
148 Followers 136 Following Here are some of the new innovations and trends in US Healthcare
Intiva Health @IntivaHealth
21K Followers 5K Following Developers of Incredable, a #medical #credentialing platform powered by TIVA Token. TIVA President: @McInsauce Tg: https://t.co/M8UOfAT7TE
















