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Fernando Pérez

@fernandoperez.org
1.7K followers 685 following 136 posts

Open source, open science, AI in science for earth/ice and healthcare. IPython creator, @projectjupyter.bsky.social and 2i2c.org co-founder. Prof @ UC Berkeley Stats, director of @ucbids.bsky.social, co-director @schmidtdse.bsky.social; LBL scientist.

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Fernando Pérez @fernandoperez.org · 13/08/2026
Are you interested in building open tools for biomedical science in the @jupyter.org ecosystem? Infrastructure, front end, AI workflows, product design - we are recruiting for multiple positions at @ucbids.bsky.social and would love to hear from you! bids.berkeley.edu/news/join-us...
bids.berkeley.edu
Join us: we're recruiting four positions to build BioJupyter at BIDS | Berkeley Institute for Data Science (BIDS)
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Schmidt DSE at UC Berkeley @schmidtdse.bsky.social · 11/08/2026
Cheers to @uofcalifornia.bsky.social Berkeley News for this great write-up on the benefits of #OpenSourceAI models, featuring Schmidt DSE faculty advisor @cboettig.bsky.social and faculty co-director @fernandoperez.org. Read & share: news.berkeley.edu/2026/08/11/w... #OpenSource #OpenScience
news.berkeley.edu
Why we don’t need more data centers to build better AI - Berkeley News
Instead of power-hungry AI models, UC Berkeley experts argue that smaller and more efficient open-source technologies are the way of the future.
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Berkeley Institute for Data Science (BIDS) @ucbids.bsky.social · 07/08/2026
We officially moved into the Barbara and Gerson Bakar Gateway today, the new home of @berkeleycdss.bsky.social 📦📦❤️ We'll see our college colleagues daily, and welcome collaborators from across campus, the Bay Area, and our global open source community. #UCBerkeley #AI #DataScience #OpenSource
The building from the outside with a green  lawn through the gateway to campusThe BIDS space from the outside, on the first floor and with large windowsThe BIDS space on the inside with empty desks, high ceilings and large windows
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Berkeley Institute for Data Science (BIDS) @ucbids.bsky.social · 23/07/2026
Can AI watch a complex television series and understand its artistic choices? 🤔 #CulturalAnalytics talk: Peter Leonard tests the limits of modern multimodal models using The Kingdom, showing where advanced and old AI technologies excel and fail. Recap & recording: bids.berkeley.edu/news/testing...
Person stands behind a lectern and gestures toward a screen that projects data.
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Nina Beguš @ninabegus.bsky.social · 17/07/2026
...processed, and the models’ hallucinations. Featuring works by Nouf Aljowaysir; Gašper and Nina Beguš & Metahaven; Grégory Chatonsky; Kate Crawford & Vladan Joler; Asma Kazmi & Jill Miller; Andrea Khôra; Occitane Lacurie & Barnabé Sauvage; Greg Niemeyer; and Mario Santamaria & Alex Saum-Pascual.
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Nina Beguš @ninabegus.bsky.social · 17/07/2026
The "Hidden Layers" exhibition examines some of the concealed dimensions of contemporary AI culture — the planetary infrastructures of extraction and computation, the often invisible human labor, the latent vector spaces within which culture is compressed and... events.berkeley.edu/art/event/32...
events.berkeley.edu
Exhibition Opening Reception: “Hidden Layers: AI Infrastructures and Hallucinations”
Please join us for an opening reception for the exhibition Hidden Layers: AI Infrastructures and Hallucinations at the Worth Ryder Art Gallery. Thi...
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Joel Chan @joelchan86.bsky.social · 10/07/2026
Friends! I'm bad at advertising but better late than never! I'm co-organizing a workshop at #CSCW2026 exploring the future of infrastructure, in conversation with its deep roots in CSCW scholarship. Please join us! cscw2026-infrastructure-workshop.github.io My short pitch below 👇
cscw2026-infrastructure-workshop.github.io
Home — Infrastructure and Collaborative Ecologies@CSCW'26
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Berkeley Institute for Data Science (BIDS) @ucbids.bsky.social · 19/06/2026
🌟 📚 Join BIDS at the annual National Workshop for Data Science Education, June 22-24! Our panel on June 23 will feature #Jupyter ecosystem topics #JupyterBook, #GeoJupyter, #JupyterAI It's free to attend in person or on Zoom! Hope to see you there ➡️ cdss.berkeley.edu/dsus/nwdse
A presenter stands behind a podium, with a table and 5 seated panelists to the side, and a large screen on the wall behind them is displaying a presentation slide.
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Fernando Pérez @fernandoperez.org · 15/06/2026
Congrats to @serenabonaretti.bsky.social or the physical publication of her awesome "Learn Python with Jupyter" 📙 👏 🎉 , and thanks for sending me a physical copy to Berkeley! The weaving of Python+Jupyter and how to use them to think is wonderful. We're fortunate to have Serena in our community!
Photo of Fernando Pérez holding the book "Learn Python with Jupyter" by Serena Bonaretti, with a metal print of the Jupyter logo in a rear blue wall, above a window with shades partially drawn.
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Fernando Pérez @fernandoperez.org · 08/06/2026
📣 A great postdoc opportunity to work with @tsnow03.bsky.social at the intersection of statistics, earth science and open science! book.cryointhecloud.com/postdoc
book.cryointhecloud.com
Postdoctoral Researcher or Research Specialist Opportunity - CryoCloud Website
Welcome to CryoCloud: Empowering collaborative Earth science in the cloud
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Fernando Pérez @fernandoperez.org · 15/05/2026
The @lightconeresearch.bsky.social team, a Berkeley Physics/ @ucbids.bsky.social @cnrs.fr collaboration to build open source standards and infrastructure to support better transparency, inspectability, reproducibility and human insight into AI assisted research. Delighted to advise this great team!
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Lightcone Research @lightconeresearch.bsky.social · 14/05/2026
Today, we’re launching Lightcone Research. AI is changing what’s tractable in scientific research, putting more ambitious questions within reach. We build open-source infra that turn this expanded reach into results other scientists can reproduce, inspect, and build on.
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Fernando Pérez @fernandoperez.org · 11/05/2026
If you work in open source software, particularly in the life sciences, the new @os4science.org Fund is launching its inaugural call for proposals!! A great opportunity with a broad perspective on what can be funded.
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Fernando Pérez @fernandoperez.org · 04/05/2026
📣 New #OpenSource fund for #science! Building on the impact of EOSS led by @dartar.bsky.social , this new @renphil21.bsky.social program will help scientific communities continue building our computational foundations as an open, public good. os4science.org/news/os4scie...
os4science.org
Open Source for Science Fund Launches to Power AI-Driven Discovery
A new multi-donor fund by Renaissance Philanthropy seeded by Biohub and Wellcome opens its first call for proposals.
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Fernando Pérez @fernandoperez.org · 20/03/2026
Last call, today at 11am, Evans Hall at UC Berkeley and online! Come for a talk and discussion by the amazing @gaelvaroquaux.bsky.social on scikit-learn, open science and an open discussion in today's science and AI context, hosted by @ucbids.bsky.social and Berkeley Statistics!
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Julia M. Rohrer @dingdingpeng.the100.ci · 17/03/2026
Do you have any thoughts on systemic bottlenecks in science and how to fix them? Astera is running an essay competition! astera.org/essay-compet...
2026 Essay Competition
Identifying Systemic Bottlenecks to Science
An essay competition inviting active scientists from any sector to share concrete research challenges that you hypothesize are caused by broad structural or systemic bottlenecks in science, and experimental strategies to fix them.

Read about our motivation and rationale here.

1st Prize	2nd Prize	3rd Prize
$30,000	$15,000	$5,000
 

Open to: Any active scientists

Publish your essay publicly and share the link here by May 1

Winners will be announced by June 15
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Union of Concerned Scientists @ucs.org · 17/03/2026
UCS filed Freedom of Information Act requests to the NSF to publicly release all of its communications about its plans to restructure the National Center for Atmospheric Research (NCAR). “NCAR represents one of the most successful models of federally supported scientific infrastructure in the US.”
ucs.org
UCS Files Requests to Make Proposals Public on How to Restructure National Center for Atmospheric Research
The Union of Concerned Scientists today filed Freedom of Information Act requests to the U.S. National Science Foundation to publicly release all of its communications about its plans to restructure t...
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Fernando Pérez @fernandoperez.org · 17/03/2026
"Cementing a machine-learning ecosystem: scikit-learn and beyond": on Friday March 20, we at @ucbids.bsky.social and the Berkeley Statistics department are delighted to host @gaelvaroquaux.bsky.social for a seminar. Join us in person or online! events.berkeley.edu/BIDS/event/3...
events.berkeley.edu
Cementing a machine-learning ecosystem: scikit-learn and beyond
Please join us for a special event with Gaël Varoquaux (Probabl, scikit-learn), co-sponsored by BIDS, CDSS, and the Department of Statistics! Varo...
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Fernando Pérez @fernandoperez.org · 17/03/2026
"Cementing a machine-learning ecosystem: scikit-learn and beyond": on Friday March 20, we at @ucbids.bsky.social and the Berkeley Statistics department are delighted to host @gaelvaroquaux.bsky.social for a seminar. Join us in person or online! events.berkeley.edu/BIDS/event/3...
events.berkeley.edu
Cementing a machine-learning ecosystem: scikit-learn and beyond
Please join us for a special event with Gaël Varoquaux (Probabl, scikit-learn), co-sponsored by BIDS, CDSS, and the Department of Statistics! Varo...
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Berkeley Institute for Data Science (BIDS) @ucbids.bsky.social · 12/03/2026
🎊 We are proud to share our 2025 Annual Report, a celebration of our collaborators, alumni, and supporters + BIDS impact: bids.berkeley.edu/annual-repor... @fernandoperez.org #OpenSource
Text from the Letter from the Directors on the BIDS 2025 Annual Report, with two large headshots of the directors and a photo of the UC Berkeley campanile and the San Francisco Bay in the background.
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Fernando Pérez @fernandoperez.org · 12/03/2026
It's an honor to work with the @ucbids.bsky.social team, part of our new @berkeleycdss.bsky.social college! While "Data Science" may now be a well established idea, there is still much work to do, and Berkeley is a unique environment for this!
bids.berkeley.edu
Director's Vision 2024 | Berkeley Institute for Data Science (BIDS)
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Fernando Pérez @fernandoperez.org · 19/02/2026
Interested in open science across disciplines, but especially in earth/climate/environmental tools, workflows and communities? Join us -live/zoom! @ucbids.bsky.social OSPO event, hosted at AI Futures Lab, for a discussion with NASA scientist Tasha Snow. events.berkeley.edu/BIDS/event/3...
events.berkeley.edu
OSPO Monthly Meetup: Open science as a process, not a product
Join us in shaping the future of open source at UC Berkeley, building on its rich legacy of leadership in open source software development. There w...
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Eos @eos.org · 13/02/2026
On a busy day for science policy, it looks like oversight and operations of NCAR’s supercomputing center are transitioning to a third-party operator. www.nsf.gov/news/transit... Lean more about the costs of dismantling NCAR with this opinion from @carlonimbus.bsky.social.
eos.org
What Americans Lose If Their National Center for Atmospheric Research Is Dismantled - Eos
Five ways dismantling NCAR will cost the American people, and two ways to save it.
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Project Jupyter @jupyter.org · 12/02/2026
🎉 JupyterLite is now part of Project Jupyter! Run Jupyter notebooks directly in your browser: no server, no setup. Many thanks to the JupyterLite contributors and supporters like QuantStack, Bloomberg and the Gates Foundation. 🔗 blog.jupyter.org/jupyterlite-...
blog.jupyter.org
JupyterLite Officially Joins Project Jupyter!
We are thrilled to announce that JupyterLite is now an official part of Project Jupyter. This milestone marks a significant step forward…
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2i2c @2i2c.org · 12/02/2026
We’re proud to share a public roadmap for 2i2c's team - it's a step toward more participatory, transparent open development with our member and upstream communities. 👉 2i2c.org/blog/public-...
2i2c.org
2i2c Platform Roadmap - 2i2c Platform Roadmap
Development priorities and initiatives for 2i2c's platform
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2i2c @2i2c.org · 10/02/2026
We’re incredibly proud to announce that Jenny Wong was invited to join the JupyterHub team as a contributor and maintainer! 2i2c.org/blog/jenny-j...
2i2c.org
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2i2c @2i2c.org · 06/02/2026
Angus just gave a FOSDEM 2026 talk on Introducing Jupyter Book 2 and why this stack matters for reusable, reproducible computational publishing. 2i2c.org/blog/fosdem-...
2i2c.org
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Michael Zingale @michaelzingale.bsky.social · 05/02/2026
More fun with accessibility: how to add alt-text for a matplotlib figure in a Jupyter notebook when it is converted to HTML. Lots of github issues about this when you google, but no firm standard. Wound up with a hackish postprocessing script that does the job: github.com/zingale/matp...
github.com
GitHub - zingale/matplotlib_accessible: experiments with alt text in matplotlib
experiments with alt text in matplotlib. Contribute to zingale/matplotlib_accessible development by creating an account on GitHub.
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Qiusheng Wu @giswqs.bsky.social · 06/02/2026
📢 Call for Papers | Special Issue in Remote Sensing of Environment We are excited to announce a forthcoming special issue in Remote Sensing of Environment focused on the rapidly evolving area of Geospatial Foundation Models and their transformative potential for environmental remote sensing.
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Steve Purves @opensci.dev · 06/02/2026
Adding an `anywidget` style/based directive & renderer into the core @mystmd.org stack is a big win for custom interactivity and extensibility. My contribution this week: to round off the first cut implementation - based on what've had in prod at @curvenote.com. opensci.dev/articles/ups...
opensci.dev
Upstreaming `anywidget` into the MyST Markdown core - opensci.dev
A techbit on upstreaming the anywidget directive to the MyST Markdown core stack, enabling first-class support for embedding JS widgets in MyST Markdown documents.
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2i2c @2i2c.org · 05/02/2026
UC Berkeley's DataHub team shared error log data that helped us redesign error handling in nbgitpuller - a tool used across education and research to distribute Jupyter content via a single link. 2i2c.org/blog/nbgitpu...
2i2c.org
Better sharing UX with nbgitpuller and contextual error handling | 2i2c
TL;DR # nbgitpuller now has improved UX context-aware error handling. Try out the pre-release version 1.3.0b1 and let us know what you think by opening an issue or via the feedback form below 🚀
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Chris Holdgraf @choldgraf.com · 05/02/2026
This was an exciting round of UX improvements to nbgitpuller thanks to feedback from the team at UC Berkeley. Thanks to the CloudBank team and @ucbids.bsky.social for facilitating collaborations like this!
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M B @mbussonn.bsky.social · 04/02/2026
@jupyter.org Security workshop on March 31st (TDOV) in Berkeley with @ucbids.bsky.social events.linuxfoundation.org/security-too... #jupyterworkshops #jupyter
events.linuxfoundation.org
Jupyter Workshops: Security Tooling Sprint | LF Events
Contribute to Project Jupyter security by evaluating and integrating security tools across the SDLC, improving developer, CI/CD, and security assessments now.
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Qiusheng Wu @giswqs.bsky.social · 03/02/2026
🎉 Excited to share that my paper has been published in the Journal of Open Source Software! 📄 "GeoAI: A Python package for integrating artificial intelligence with geospatial data analysis and visualization"
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Alexander Doria @dorialexander.bsky.social · 01/02/2026
It took me weeks, but finally it's there: an overlong blogpost on synthetic pretraining. vintagedata.org/blog/posts/s...
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Lukas Heinrich @lukasheinrich.com · 01/02/2026
Scaling Laws in Particle Physics Data! This is a result I've been itching to share and it's finally out. One of the big open questions is how much better AI-based methods at particle colliders can still become. 1/4
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SciPy Conference 2026 @scipyconf.bsky.social · 27/01/2026
🤔 Thinking about submitting a proposal to SciPy 2026 and want feedback or guidance? We’ve got you covered ✨ 🚀 Join our Proposal Writing Office Hours 📅 First session is next week 👉 Register here: www.scipy2026.scipy.org#officehours
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David Shiffman, Ph.D. 🦈 @whysharksmatter.bsky.social · 28/01/2026
What Americans Lose If Their National Center for Atmospheric Research Is Dismantled - Eos | Five ways dismantling NCAR will cost the American people, and two ways to save it.
eos.org
What Americans Lose If Their National Center for Atmospheric Research Is Dismantled - Eos
Five ways dismantling NCAR will cost the American people, and two ways to save it.
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Eos @eos.org · 28/01/2026
Opinion: For more than 6 decades, NCAR has shown that open, collaborative science can save lives, support economic resilience and national defense, and expand opportunity across generations. #SaveNCAR
eos.org
What Americans Lose If Their National Center for Atmospheric Research Is Dismantled - Eos
Five ways dismantling NCAR will cost the American people, and two ways to save it.
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Katelyn FitzGerald @kafitzgerald.bsky.social · 28/01/2026
You might check out some of the resources from Scientific Python if you haven't already: * learn.scientific-python.org/development/... * lectures.scientific-python.org/advanced/int...
learn.scientific-python.org
Compiled packaging
This guide is maintained by the scientific Python community for the benefit of fellow scientists and research software engineers.
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Fernando Pérez @fernandoperez.org · 27/01/2026
The power of open! Awesome to see this, which builds on the open source work done at @ucbids.bsky.social years ago by @mentat.za.net and Nathaniel Smith: bids.github.io/colormap/ Nathaniel wrote up a bit more about this work in his blog: vorpus.org/blog/the-unr...
bids.github.io
matplotlib colormaps
An overview of the colormaps recommended to replace 'jet' as default.
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Wilson Sauthoff @wilsonsauthoff.bsky.social · 27/01/2026
New GRL paper on the dynamic nature of Antarctic active subglacial lakes that have boundaries that change shape, grow, shrink, or even migrate. We show stationary lake outlines can underestimate cumulative water volume change by up to ~100% and overestimate lakebed area. 📄 doi.org/10.1029/2025...
Evolving lake outlines of active subglacial lakes along lower Mercer and Whillans ice streams, West Antarctica.
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MyST Markdown @mystmd.org · 27/01/2026
We're proud to announce a new release of the Jupyter Book stack! This brings in a number of fixes and UI improvements! Check out release notes for each here: mystmd 1.8: github.com/jupyter-book... myst-theme 1.1: github.com/jupyter-book... jupyter-book 2.1.1: github.com/jupyter-book...
github.com
Release mystmd@1.8.0 · jupyter-book/mystmd
This brings in new functionality for execution concurrency, allowing you to control how many notebooks are executed in parallel during build in case you have notebooks that depend on one another or...
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Eos @eos.org · 27/01/2026
NCAR represents what is possible when a nation chooses to invest in science as a public good, writes @carlonimbus.bsky.social of @ucs.org. #SaveNCAR eos.org/opinions/wha...
eos.org
What Americans Lose If Their National Center for Atmospheric Research Is Dismantled - Eos
Five ways dismantling NCAR will cost the American people, and two ways to save it.
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Chris Holdgraf @choldgraf.com · 26/01/2026
I'm proud that 2i2c is able to make space for more people to participate in open source leadership and community building in this way! Jupyter is lucky to have April helping out :-) 2i2c.org/blog/april-j...
2i2c.org
April joins the Jupyter Community Building Working Group | 2i2c
We’re pleased to share that our People Operations Lead, April Johnson, has joined the Jupyter Community Building Working Group! This kind of work reflects how we think about foundational contributions...
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Olga Nesterova @onestpress.onestnetwork.com · 26/01/2026
France announced today it’s phasing out Teams, Zoom, etc. to be replaced with a French/European solution called Visio. The data is hosted on Outscale. Transcripts and subtitles are also handled by French providers. The target is set on 2027 for government agencies.
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2i2c @2i2c.org · 26/01/2026
Community work is infrastructure work. It’s how open source projects stay healthy, resilient, and welcoming over the long term. We're proud to share that our April (our People Lead) has joined the Jupyter Community Building Working Group! 2i2c.org/blog/april-j...
2i2c.org
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Mor Naaman @informor.bsky.social · 25/01/2026
Incredible clarity. This is the best conceptual connection I have seen between the failures of our information ecosystem and the rise of populist and conspiratorial forces
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Chris Holdgraf @choldgraf.com · 22/01/2026
I find this kind of thing really exciting - 2i2c is basically a centralized shared infrastructure team, running independent community hubs, in a way where we can directly give others control over their own infrastructure in a safe way.
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