Fernando Pérez
@fernandoperez.org
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.
Prof @ UC Berkeley Stats, director of @ucbids.bsky.social, co-director @schmidtdse.bsky.social; LBL scientist.
Pinned
Fernando Pérez
@fernandoperez.org
· Nov 7
Well, time to start setting up shop for real away from Twitter - used to be fperez_org there, used it a lot as a science feed and community building tool, til the Musk purchase.
Went quiet since but hadn't fully moved on; the election seems like a good time to shut the curtains and move.
Went quiet since but hadn't fully moved on; the election seems like a good time to shut the curtains and move.
Reposted by Fernando Pérez
We recently pushed Jupyter Book 2, which was a breaking change for many of our users! We considered publishing a completely different package (e.g., `jupyter-book2`) but decided against it. Here's a quick rationale why:
Why we made a major release for Jupyter Book 2 instead of creating a new package - Jupyter Book: Blog
Updates from the Jupyter Book subproject.
blog.jupyterbook.org
November 7, 2025 at 6:16 PM
We recently pushed Jupyter Book 2, which was a breaking change for many of our users! We considered publishing a completely different package (e.g., `jupyter-book2`) but decided against it. Here's a quick rationale why:
Reposted by Fernando Pérez
Job Opportunity Alert
Instructional Professor (open rank) in Data Science: apply.interfolio.com/176416
EOE/Vet/Disability
Instructional Professor (open rank) in Data Science: apply.interfolio.com/176416
EOE/Vet/Disability
Apply - Interfolio
{{$ctrl.$state.data.pageTitle}} - Apply - Interfolio
apply.interfolio.com
November 7, 2025 at 3:00 PM
Job Opportunity Alert
Instructional Professor (open rank) in Data Science: apply.interfolio.com/176416
EOE/Vet/Disability
Instructional Professor (open rank) in Data Science: apply.interfolio.com/176416
EOE/Vet/Disability
Reposted by Fernando Pérez
Slides for my @foss4gna.bsky.social NA talk, "Cloud-Native Geospatial Metadata with stac-geoparquet" are at www.gadom.ski/presentation...
I subtitled the talk "Practical STAC", because #stac-geoparquet was motivated by real-world problems found while managing large @stacspec.bsky.social systems
I subtitled the talk "Practical STAC", because #stac-geoparquet was motivated by real-world problems found while managing large @stacspec.bsky.social systems
stac-geoparquet
www.gadom.ski
November 5, 2025 at 10:44 AM
Slides for my @foss4gna.bsky.social NA talk, "Cloud-Native Geospatial Metadata with stac-geoparquet" are at www.gadom.ski/presentation...
I subtitled the talk "Practical STAC", because #stac-geoparquet was motivated by real-world problems found while managing large @stacspec.bsky.social systems
I subtitled the talk "Practical STAC", because #stac-geoparquet was motivated by real-world problems found while managing large @stacspec.bsky.social systems
Reposted by Fernando Pérez
I'm on the academic job market!
I design and analyze probabilistic machine-learning methods---motivated by real-world scientific constraints, and developed in collaboration with scientists in biology, chemistry, and physics.
A few highlights of my research areas are:
I design and analyze probabilistic machine-learning methods---motivated by real-world scientific constraints, and developed in collaboration with scientists in biology, chemistry, and physics.
A few highlights of my research areas are:
November 7, 2025 at 2:47 PM
I'm on the academic job market!
I design and analyze probabilistic machine-learning methods---motivated by real-world scientific constraints, and developed in collaboration with scientists in biology, chemistry, and physics.
A few highlights of my research areas are:
I design and analyze probabilistic machine-learning methods---motivated by real-world scientific constraints, and developed in collaboration with scientists in biology, chemistry, and physics.
A few highlights of my research areas are:
Reposted by Fernando Pérez
Shravan Achar and Zach Sailor demonstrating a simple sharing service for Jupyter Notebooks #jupytercon
November 5, 2025 at 10:32 PM
Shravan Achar and Zach Sailor demonstrating a simple sharing service for Jupyter Notebooks #jupytercon
Reposted by Fernando Pérez
So much activity at #JupyterCon 2025 -> tutorials 🧠, meetups 🤝, talks 🎤! Thankfully, Silas Santini captured some highlights and shared some valuable resources!
Read "Themes of Day 1, JupyterCon 2025: Collaboration and Modularity" for details:
bids.berkeley.edu/news/themes-...
Read "Themes of Day 1, JupyterCon 2025: Collaboration and Modularity" for details:
bids.berkeley.edu/news/themes-...
November 6, 2025 at 12:46 AM
So much activity at #JupyterCon 2025 -> tutorials 🧠, meetups 🤝, talks 🎤! Thankfully, Silas Santini captured some highlights and shared some valuable resources!
Read "Themes of Day 1, JupyterCon 2025: Collaboration and Modularity" for details:
bids.berkeley.edu/news/themes-...
Read "Themes of Day 1, JupyterCon 2025: Collaboration and Modularity" for details:
bids.berkeley.edu/news/themes-...
Reposted by Fernando Pérez
We're live at #JupyterCon! Here's @mfisher87.bsky.social walking attendees through #GeoJupyter with @fernandoperez.org 🧑🏻💻
🌏 GeoJupyter is an open and community-driven effort to reimagine #geospatial interactive #computing experiences for education, research, & industry: bit.ly/49CMRY1 #GIS #Jupyter
🌏 GeoJupyter is an open and community-driven effort to reimagine #geospatial interactive #computing experiences for education, research, & industry: bit.ly/49CMRY1 #GIS #Jupyter
November 4, 2025 at 7:40 PM
We're live at #JupyterCon! Here's @mfisher87.bsky.social walking attendees through #GeoJupyter with @fernandoperez.org 🧑🏻💻
🌏 GeoJupyter is an open and community-driven effort to reimagine #geospatial interactive #computing experiences for education, research, & industry: bit.ly/49CMRY1 #GIS #Jupyter
🌏 GeoJupyter is an open and community-driven effort to reimagine #geospatial interactive #computing experiences for education, research, & industry: bit.ly/49CMRY1 #GIS #Jupyter
Reposted by Fernando Pérez
Seeking a three year postdoc in the field of ocean biogeochemistry and productivity using mechanistic models and synthesis of observations. Note the short fuse for applications. Please help distribute. All nationalities welcome to apply! 🌊
www.jobs.ac.uk/job/DPG117/p...
www.jobs.ac.uk/job/DPG117/p...
Postdoctoral Research Associate at University of Liverpool
Looking for a new job opportunity in academia? Check out this job opening for a Postdoctoral Research Associate on jobs.ac.uk!
www.jobs.ac.uk
October 29, 2025 at 5:38 PM
Seeking a three year postdoc in the field of ocean biogeochemistry and productivity using mechanistic models and synthesis of observations. Note the short fuse for applications. Please help distribute. All nationalities welcome to apply! 🌊
www.jobs.ac.uk/job/DPG117/p...
www.jobs.ac.uk/job/DPG117/p...
Reposted by Fernando Pérez
Today, napari users can’t fully leverage Xarray’s labeled metadata, as slider names, units & dimensions often get out of sync. That’s changing. At SciPy 2025, napari, Xarray & CellProfiler devs began a collab to build true metadata-aware visualization across sciences.
earthmover.io/blog/scienti...
earthmover.io/blog/scienti...
Scientific Data Visualization with Xarray and Napari - Earthmover
Ian Hunt-Isaak Xarray Community Developer Tim Monko Neuroscience PhD & napari community manager This blog was also published on the xarray blog and the napari blog. TL;DR Making Napari and Xarray work...
earthmover.io
October 29, 2025 at 5:53 PM
Today, napari users can’t fully leverage Xarray’s labeled metadata, as slider names, units & dimensions often get out of sync. That’s changing. At SciPy 2025, napari, Xarray & CellProfiler devs began a collab to build true metadata-aware visualization across sciences.
earthmover.io/blog/scienti...
earthmover.io/blog/scienti...
Reposted by Fernando Pérez
TLDR; The PSF has made the decision to put our community and our shared diversity, equity, and inclusion values ahead of seeking $1.5M in new revenue. Please read and share. pyfound.blogspot.com/2025/10/NSF-...
🧵
🧵
The official home of the Python Programming Language
www.python.org
October 27, 2025 at 2:47 PM
TLDR; The PSF has made the decision to put our community and our shared diversity, equity, and inclusion values ahead of seeking $1.5M in new revenue. Please read and share. pyfound.blogspot.com/2025/10/NSF-...
🧵
🧵
Reposted by Fernando Pérez
You can thank our idiotic governmental leadership for making us all less secure. I'm incredibly proud to be a PSF member. www.theregister.com/2025/10/27/p...
Python Foundation rejects $1.5M grant with no-DEI strings
: Foundation says it won't compromise policy of inclusivity even if that cash would've really helped
www.theregister.com
October 29, 2025 at 1:32 AM
You can thank our idiotic governmental leadership for making us all less secure. I'm incredibly proud to be a PSF member. www.theregister.com/2025/10/27/p...
Reposted by Fernando Pérez
Very well said. Short and to the point and worth every one of the 5 minutes it will take you to read it.
The Majority AI View - Anil Dash
The Majority AI View - Anil Dash
The Majority AI View - Anil Dash
A blog about making culture. Since 1999.
www.anildash.com
October 25, 2025 at 12:42 PM
Very well said. Short and to the point and worth every one of the 5 minutes it will take you to read it.
The Majority AI View - Anil Dash
The Majority AI View - Anil Dash
Reposted by Fernando Pérez
That merely being “under review” by a Nature family journal is offered as a quality proxy for a paper is a tragic illustration of the extent to which academia is addicted to brands and outsources evaluation
October 25, 2025 at 6:37 PM
That merely being “under review” by a Nature family journal is offered as a quality proxy for a paper is a tragic illustration of the extent to which academia is addicted to brands and outsources evaluation
Reposted by Fernando Pérez
Inspired by a chat with @bajoran.engineer at #PyTorchCon, I wrote up my thoughts about #Python as a scripting engine for apps.
phildini.dev/python-in-ev...
Shares appreciated, commentary welcome but if you're a jerk I'll block you 😇
Maybe of interest to @anacondainc.bsky.social as well ✨
phildini.dev/python-in-ev...
Shares appreciated, commentary welcome but if you're a jerk I'll block you 😇
Maybe of interest to @anacondainc.bsky.social as well ✨
Python should be in every application - phildini.dev
The best in-app scripting engine is within reach
phildini.dev
October 24, 2025 at 8:55 PM
Inspired by a chat with @bajoran.engineer at #PyTorchCon, I wrote up my thoughts about #Python as a scripting engine for apps.
phildini.dev/python-in-ev...
Shares appreciated, commentary welcome but if you're a jerk I'll block you 😇
Maybe of interest to @anacondainc.bsky.social as well ✨
phildini.dev/python-in-ev...
Shares appreciated, commentary welcome but if you're a jerk I'll block you 😇
Maybe of interest to @anacondainc.bsky.social as well ✨
Reposted by Fernando Pérez
Really thrilled to see the renewed momentum from @ucbids.bsky.social on open source infrastructure! A new partnership with @2i2c.org puts supporting tools, their developers, and their community at the center. cdss.berkeley.edu/news/berkele...
Berkeley Institute for Data Science partners with 2i2c on open source infrastructure
The Berkeley Institute for Data Science (BIDS) has formally partnered with 2i2c, a nonprofit that provides open source support services with shared digital tools and resources for researchers and educ...
cdss.berkeley.edu
October 23, 2025 at 4:29 AM
Really thrilled to see the renewed momentum from @ucbids.bsky.social on open source infrastructure! A new partnership with @2i2c.org puts supporting tools, their developers, and their community at the center. cdss.berkeley.edu/news/berkele...
Reposted by Fernando Pérez
It’s hard to explain how much George Norlin’s name being on my college’s beloved library means to me.
When CU Boulder’s president George Norlin stood up to the Klan in the 1920s, he risked funding to defend academic freedom.
Nearly a century later, Texas A&M faces its own test and the question remains the same: who has the courage to say no?
yellowscene.com/2025/10/10/w...
Nearly a century later, Texas A&M faces its own test and the question remains the same: who has the courage to say no?
yellowscene.com/2025/10/10/w...
What Texas A&M Can Learn From CU Boulder’s Darkest Hour
Texas A&M’s recent controversy echoes a moment in Colorado’s past, when CU Boulder’s George Norlin stood firm for academic freedom.
yellowscene.com
October 21, 2025 at 10:46 PM
It’s hard to explain how much George Norlin’s name being on my college’s beloved library means to me.
Reposted by Fernando Pérez
I don't ever ask this, but if you have a LinkedIn account, I am actually finding some success with the "please try to be normal about AI! Don't listen to the tycoons who are lying to you!" message, so if you're up for amplifying a link, I'd appreciate it: www.linkedin.com/posts/anilda...
The Majority AI View - Anil Dash | Anil Dash | 91 comments
Here's something remarkable: You almost *never* hear the most popular view of AI that the majority of people who work in tech have about technologies like LLMs. By popular request, I've tried to sum u...
www.linkedin.com
October 21, 2025 at 6:43 PM
I don't ever ask this, but if you have a LinkedIn account, I am actually finding some success with the "please try to be normal about AI! Don't listen to the tycoons who are lying to you!" message, so if you're up for amplifying a link, I'd appreciate it: www.linkedin.com/posts/anilda...
Interested in a sustainable future for open source communities in research and education?
@kirstiejane.bsky.social @ucbids.bsky.social are hosting @2i2c.org leads @choldgraf.com and Yuvi Panda, w/ Jarrod Millman at the AI Futrues Lab-supported by UC Investments:
events.berkeley.edu/BIDS/event/3...
@kirstiejane.bsky.social @ucbids.bsky.social are hosting @2i2c.org leads @choldgraf.com and Yuvi Panda, w/ Jarrod Millman at the AI Futrues Lab-supported by UC Investments:
events.berkeley.edu/BIDS/event/3...
OSPO Monthly Meetup: Launching the BIDS membership of 2i2c
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...
events.berkeley.edu
October 16, 2025 at 4:50 PM
Interested in a sustainable future for open source communities in research and education?
@kirstiejane.bsky.social @ucbids.bsky.social are hosting @2i2c.org leads @choldgraf.com and Yuvi Panda, w/ Jarrod Millman at the AI Futrues Lab-supported by UC Investments:
events.berkeley.edu/BIDS/event/3...
@kirstiejane.bsky.social @ucbids.bsky.social are hosting @2i2c.org leads @choldgraf.com and Yuvi Panda, w/ Jarrod Millman at the AI Futrues Lab-supported by UC Investments:
events.berkeley.edu/BIDS/event/3...
The interactive demos that @geostatsguy.bsky.social (Michael Pyrcz, prof @ UT Austin and prolific creator of open educational content) creates are an incredible collection for learning stats/geospatial data with Python, and a great showcase of using @jupyter.org widgets for exploring concepts.
I’ve spent the past week refining my free e-book, Applied Geostatistics in Python 📚💻
glossary 📖, illustrations 🎨, & descriptions, 32 chapters, downloadable Python workflows 🐍!
My university content in a more accessible format to reach a broader audience 🌍 🚀
geostatsguy.github.io/GeostatsPyDe...
glossary 📖, illustrations 🎨, & descriptions, 32 chapters, downloadable Python workflows 🐍!
My university content in a more accessible format to reach a broader audience 🌍 🚀
geostatsguy.github.io/GeostatsPyDe...
October 15, 2025 at 2:02 AM
The interactive demos that @geostatsguy.bsky.social (Michael Pyrcz, prof @ UT Austin and prolific creator of open educational content) creates are an incredible collection for learning stats/geospatial data with Python, and a great showcase of using @jupyter.org widgets for exploring concepts.
Reposted by Fernando Pérez
OpenNeuro @openneuro.bsky.social just hit a huge milestone: 1500 datasets! Congrats to the team on making this project so successful over the last 7 years.
October 13, 2025 at 11:35 PM
OpenNeuro @openneuro.bsky.social just hit a huge milestone: 1500 datasets! Congrats to the team on making this project so successful over the last 7 years.
Reposted by Fernando Pérez
Honored to see our MeteoSaver software featured among the @time.com top-400 best inventions of 2025. MeteoSaver is a open-source weather data rescue software developed by @derrickmuheki.bsky.social working @hydr-vub.bsky.social @vubrussel.bsky.social
time.com/collections/...
time.com/collections/...
MeteoSaver: The Best Inventions of 2025: Special Mentions
Find out why MeteoSaver earned a special mention on TIME's list of 2025's best inventions.
time.com
October 10, 2025 at 5:49 PM
Honored to see our MeteoSaver software featured among the @time.com top-400 best inventions of 2025. MeteoSaver is a open-source weather data rescue software developed by @derrickmuheki.bsky.social working @hydr-vub.bsky.social @vubrussel.bsky.social
time.com/collections/...
time.com/collections/...
Reposted by Fernando Pérez
This has been a wonderful project. It was one of the first examples that clearly demonstrated the power of separating specification from implementation in HEP analysis software and also ushered in major advances in rich publishing for open science.
Seems that #pyhf has finally creeped over the 200 citations on INSPIRE recently. :) 🎉
inspirehep.net/literature?q...
inspirehep.net/literature/1...
Nice little milestone for us all to celebrate, @lukasheinrich.com, @giordonstark.com, @kylecranmer.bsky.social. Cheers!
inspirehep.net/literature?q...
inspirehep.net/literature/1...
Nice little milestone for us all to celebrate, @lukasheinrich.com, @giordonstark.com, @kylecranmer.bsky.social. Cheers!
October 9, 2025 at 1:44 PM
This has been a wonderful project. It was one of the first examples that clearly demonstrated the power of separating specification from implementation in HEP analysis software and also ushered in major advances in rich publishing for open science.
Reposted by Fernando Pérez
Imagine, just for a moment, a climate future where the facts cannot be deleted...
If that sounds like an ideal future for you and/or your family make sure to check out our website (Climate.us) and give us a follow on our social media accounts.
If that sounds like an ideal future for you and/or your family make sure to check out our website (Climate.us) and give us a follow on our social media accounts.
October 6, 2025 at 8:05 PM
Imagine, just for a moment, a climate future where the facts cannot be deleted...
If that sounds like an ideal future for you and/or your family make sure to check out our website (Climate.us) and give us a follow on our social media accounts.
If that sounds like an ideal future for you and/or your family make sure to check out our website (Climate.us) and give us a follow on our social media accounts.
Reposted by Fernando Pérez
honestly I don't really mind writing the 15 page research summary (though 10 pages would be better for both writing and reviewing). It is, inter alia, a helpful conduit to plan out a project.
What kills me is the extra week(!) filling in tabs in research.gov, and ...
1/
What kills me is the extra week(!) filling in tabs in research.gov, and ...
1/
the amount of time we spend trying to raise $$$ for our research is absolutely immense and results in a huge amount of wasted time. BUT there is a limited amount of money, so they have to have some method of distributing it. not sure what the best way to do it is.
October 5, 2025 at 1:53 PM
honestly I don't really mind writing the 15 page research summary (though 10 pages would be better for both writing and reviewing). It is, inter alia, a helpful conduit to plan out a project.
What kills me is the extra week(!) filling in tabs in research.gov, and ...
1/
What kills me is the extra week(!) filling in tabs in research.gov, and ...
1/
Huge congratulations to NASA's @cgentemann.bsky.social for the #AGU2025 Open Science Recognition Prize!!! 🎉🎊🚀
Chelle has been a steadfast leader in open science, from data, to code, infrastructure, policy and education.
This could not be more highly deserved!
www.agu.org/honors-home/...
Chelle has been a steadfast leader in open science, from data, to code, infrastructure, policy and education.
This could not be more highly deserved!
www.agu.org/honors-home/...
September 26, 2025 at 4:27 PM
Huge congratulations to NASA's @cgentemann.bsky.social for the #AGU2025 Open Science Recognition Prize!!! 🎉🎊🚀
Chelle has been a steadfast leader in open science, from data, to code, infrastructure, policy and education.
This could not be more highly deserved!
www.agu.org/honors-home/...
Chelle has been a steadfast leader in open science, from data, to code, infrastructure, policy and education.
This could not be more highly deserved!
www.agu.org/honors-home/...