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Jacob S. Zelko

@thecedarprince.bsky.social
1.5K followers 46 following 404 posts

🤓: Applied Math & Biomed Engineer; Research Affl @usask.ca 🔎: Health informatics, public health, applied cat. theory & open source/science 📝: EN/ES/DE/AR 🌐: Blog @ jacobzelko.com 📹: Twitch @ www.twitch.tv/thecedarprince

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Jacob S. Zelko @thecedarprince.bsky.social · 15/09/2026
I'd be very interested in those -- thanks! Also keen to hear what sparked your reading group @sfiscience.bsky.social and what takeaways you had! To me, seems there are multiple subtly differing defs of causality across fields. I want to understand why and what problems each new def addresses.
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Jacob S. Zelko @thecedarprince.bsky.social · 12/09/2026
What is causality? I think it is an order between two things. However, I've been struggling to find definitions for it. Could you share me your definition? I want to include definitions in this blog post I am working on to enumerate definitions across domains. #mathsky #medsky #academicsky 🧪 📊🛟
jacobzelko.com
Types of Causality
Some overviews of causality from different fields
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Jacob S. Zelko @thecedarprince.bsky.social · 13/09/2026
Thanks! Couple follow-ups: What do you mean by "facilitation" and "progression"? Borrowing your language, what is A conditioned on exactly? What domain does this type of definition often come from?
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Jacob S. Zelko @thecedarprince.bsky.social · 13/09/2026
Thanks John! If I can dig into this some more: How do you define: action, potential, and links? How would you say that potential and intent differ from one another in the context of an action? What domain does this definition come from roughly?
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Jacob S. Zelko @thecedarprince.bsky.social · 12/09/2026
Oh and also CCing #stats #statistics and #rstats people too for opinions!
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Jacob S. Zelko @thecedarprince.bsky.social · 12/09/2026
What is causality? I think it is an order between two things. However, I've been struggling to find definitions for it. Could you share me your definition? I want to include definitions in this blog post I am working on to enumerate definitions across domains. #mathsky #medsky #academicsky 🧪 📊🛟
jacobzelko.com
Types of Causality
Some overviews of causality from different fields
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Jacob S. Zelko @thecedarprince.bsky.social · 30/07/2026
Applied Category Theory 2026 was a few weeks ago and I finally finished up some of my notes about attending there in Estonia. Would a distillation of my notes be of interest for the newsletter? Happy to DM what I had and see what might make sense. 🤓
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Jacob S. Zelko @thecedarprince.bsky.social · 23/05/2026
Any luck with using PythonCall.jl for interoperating with Julia for your work Szymon? Link: juliapy.github.io/PythonCall.j...
juliapy.github.io
Home · PythonCall & JuliaCall
Documentation for PythonCall & JuliaCall.
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Sam Abbott @seabbs.bsky.social · 08/04/2026
Really pleased that the model fitting and inference for infectious disease modelling short course is running again this year (7-10th September) at #LSHTM and is now all in #julialang. www.lshtm.ac.uk/study/course...
lshtm.ac.uk
Model Fitting and Inference for Infectious Disease Dynamics | LSHTM
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Jacob S. Zelko @thecedarprince.bsky.social · 10/03/2026
Published a JuliaHealth proceedings paper: "Bringing Julia to Health: A Concise Overview of JuliaHealth"! 🎉 As the ecosystem continues to grow, I am excited to have this as a community reference and overview. 🌐 Would love your thoughts! 🤓 Catch us @juliacon.org! #julialang #academicsky 🧪 📊🛟
proceedings.juliacon.org
Bringing Julia to Health: A Concise Overview of JuliaHealth
Zelko et al., (2026). Bringing Julia to Health: A Concise Overview of JuliaHealth. The Proceedings of the JuliaCon Conferences, 8(81), 194, https://doi.org/10.21105/jcon.00194
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Jacob S. Zelko @thecedarprince.bsky.social · 10/03/2026
Published a JuliaHealth proceedings paper: "Bringing Julia to Health: A Concise Overview of JuliaHealth"! 🎉 As the ecosystem continues to grow, I am excited to have this as a community reference and overview. 🌐 Would love your thoughts! 🤓 Catch us @juliacon.org! #julialang #academicsky 🧪 📊🛟
proceedings.juliacon.org
Bringing Julia to Health: A Concise Overview of JuliaHealth
Zelko et al., (2026). Bringing Julia to Health: A Concise Overview of JuliaHealth. The Proceedings of the JuliaCon Conferences, 8(81), 194, https://doi.org/10.21105/jcon.00194
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Kevin Bonham @kevinbonham.com · 06/02/2026
Are you a life scientist? Do you use code in your work? Then this conference is for you! Come find out why julia should power your next project And don't forget to check out the Health-sciences and Pharma-focused minisymposia too! 🧪 bsky.app/profile/thec...
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Randall Munroe @xkcd.com · 03/02/2026
Proof Without Content xkcd.com/3201/
Comic. Conjecture: It’s possible to construct a convincing proof without words, pictures, or content of any kind. Proof: [empty box] [caption] Proofs without words are cool, but we can go further.
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Jacob S. Zelko @thecedarprince.bsky.social · 22/01/2026
Join JuliaHealth @juliacon.bsky.social 2026 in Mainz, Germany this summer! 🌍 Submit your #julialang poster & talk proposals by Feb 28! We would love to see you there! 🤗 See @cncastillo.bsky.social announcement's for topics & details! 🤓 Post or DM if you have ❓'s! #opensource #academicsky 🧪 🛟 📊🩺
discourse.julialang.org
JuliaCon 2026 Health Mini-Symposium
If you are using Julia for health, medicine, or biomedical research, consider submitting an abstract to the 🩺 Health Mini-Symposium at JuliaCon 2026 (10–15 August 2026, Mainz, Germany). Abstract J...
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Jacob S. Zelko @thecedarprince.bsky.social · 22/01/2026
Join JuliaHealth @juliacon.bsky.social 2026 in Mainz, Germany this summer! 🌍 Submit your #julialang poster & talk proposals by Feb 28! We would love to see you there! 🤗 See @cncastillo.bsky.social announcement's for topics & details! 🤓 Post or DM if you have ❓'s! #opensource #academicsky 🧪 🛟 📊🩺
discourse.julialang.org
JuliaCon 2026 Health Mini-Symposium
If you are using Julia for health, medicine, or biomedical research, consider submitting an abstract to the 🩺 Health Mini-Symposium at JuliaCon 2026 (10–15 August 2026, Mainz, Germany). Abstract J...
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Reposted by Jacob S. Zelko
Carlos Castillo Passi @cncastillo.bsky.social · 16/01/2026
If you are working with #JuliaLang in health, medicine, or biomedical research, consider submitting an abstract to the 🩺 Health Mini-Symposium at JuliaCon 2026 (10–15 August 2026, Mainz, Germany). @thecedarprince.bsky.social
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Jacob S. Zelko @thecedarprince.bsky.social · 27/12/2025
BlueSky friends, need your opinion: @juanlam.com challenged me to write a #newsletter. Questions I have: ✍️ - Suggestions for getting started? - Balancing time and schedule? 📖 - What topics are interesting? - How do you want to engage? #academicsky #mathsky #medsky #writing 🧪 More thoughts 👇
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Jacob S. Zelko @thecedarprince.bsky.social · 27/12/2025
Some of my interests: - Applied Category Theory - Systems Engineering - Philosophy of Science - Geospatial Health Informatics - Pandemic Science - Population Dynamics & Modeling - Christian Faith & Practice - High Performance Computing I tend to write hundreds of personal notes on these subjects.
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Jacob S. Zelko @thecedarprince.bsky.social · 27/12/2025
BlueSky friends, need your opinion: @juanlam.com challenged me to write a #newsletter. Questions I have: ✍️ - Suggestions for getting started? - Balancing time and schedule? 📖 - What topics are interesting? - How do you want to engage? #academicsky #mathsky #medsky #writing 🧪 More thoughts 👇
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Sebastian Funk @sbfnk.bsky.social · 17/12/2025
Two more fully funded PhDs in real-time infectious disease modelling & forecasting — developing methods for operational use by @ukhsa.bsky.social and others in outbreak response. UK home students, starting April or September 2026. www.lshtm.ac.uk/study/fees-a...
lshtm.ac.uk
PhD Studentships in Health Analytics and Modelling | LSHTM
The London School of Hygiene & Tropical Medicine (LSHTM), Imperial College London and the UK Health Security Agency (UKHSA) are pleased to invite applications for two PhD studentships in real-time
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Jacob S. Zelko @thecedarprince.bsky.social · 17/12/2025
Great! I think @oxinabox.net would like this -- I think you wrote a blog about Julia + BlueSky if I remember right?
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Jacob S. Zelko @thecedarprince.bsky.social · 10/12/2025
JuliaHealth won a @numfocus.bsky.social Small Dev Grant! 🎉 We'll be developing workflow guides, providing accessible on-ramps for new members, and improving org infra! ⚒️ If you're doing health work in #rstats or #python, excited to share where #julialang comes in! 🤠 #medsky #opensource 🧪 🛟 🩺📊
"Congratulations, this project has been selected this time (by the random script)."

Much excitement to be had in JuliaHealth world!
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Jacob S. Zelko @thecedarprince.bsky.social · 10/12/2025
If you want to know the details of our grant, here is our full proposal: github.com/numfocus/sma...
github.com
Improving JuliaHealth Documentation Accessibility for Community Onboarding · Issue #59 · numfocus/small-development-grant-proposals
Project The Julia Language (JuliaHealth) Summary The JuliaHealth ecosystem is rapidly expanding, with more than 50 community packages, over 300 members across Slack, Zulip, and Discourse, and tools...
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Jacob S. Zelko @thecedarprince.bsky.social · 10/12/2025
JuliaHealth won a @numfocus.bsky.social Small Dev Grant! 🎉 We'll be developing workflow guides, providing accessible on-ramps for new members, and improving org infra! ⚒️ If you're doing health work in #rstats or #python, excited to share where #julialang comes in! 🤠 #medsky #opensource 🧪 🛟 🩺📊
"Congratulations, this project has been selected this time (by the random script)."

Much excitement to be had in JuliaHealth world!
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Reposted by Jacob S. Zelko
Jacob S. Zelko @thecedarprince.bsky.social · 25/11/2025
Congrats Markian Hromiak, Aradhya Rajanala, & Katy Sadowski -- won a best community contribution award! 🎉 Showed how to shrink 220GB of synthetic medical data to 20GB w @duckdb.org, host on constrained machines, & use it via #rstats #julialang #python wrappers 🧪 #academicsky #publichealth #datasci
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Jacob S. Zelko @thecedarprince.bsky.social · 25/11/2025
Congrats Markian Hromiak, Aradhya Rajanala, & Katy Sadowski -- won a best community contribution award! 🎉 Showed how to shrink 220GB of synthetic medical data to 20GB w @duckdb.org, host on constrained machines, & use it via #rstats #julialang #python wrappers 🧪 #academicsky #publichealth #datasci
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Jacob S. Zelko @thecedarprince.bsky.social · 12/11/2025
Me: High five, me! 👋 Old Me: Way to go, me! 👋 Shout out to the #julialang Discourse for being a treasure trove of info -- check it out if you have not! Link: discourse.julialang.org Anyhow, back to automating everything with my #raspberrypi #meme #programming #academicsky
meme driven problem solving
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Jacob S. Zelko @thecedarprince.bsky.social · 12/11/2025
Me: High five, me! 👋 Old Me: Way to go, me! 👋 Shout out to the #julialang Discourse for being a treasure trove of info -- check it out if you have not! Link: discourse.julialang.org Anyhow, back to automating everything with my #raspberrypi #meme #programming #academicsky
meme driven problem solving
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Reposted by Jacob S. Zelko
Jacob S. Zelko @thecedarprince.bsky.social · 10/11/2025
To Banff & Saskatoon for maths this spring! 🇨🇦🍁 "Realizing the Promise of Agent-based Modeling via Categorical Observer Processes" 🔎 Explores category theory framing of ABMs; implementation via AlgebraicJulia! Excited to integrate SDoH data w/ ABMs. 🧪 #mathsky #medsky #publichealth #academicsky
birs.ca
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Jacob S. Zelko @thecedarprince.bsky.social · 10/11/2025
To Banff & Saskatoon for maths this spring! 🇨🇦🍁 "Realizing the Promise of Agent-based Modeling via Categorical Observer Processes" 🔎 Explores category theory framing of ABMs; implementation via AlgebraicJulia! Excited to integrate SDoH data w/ ABMs. 🧪 #mathsky #medsky #publichealth #academicsky
birs.ca
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Jacob S. Zelko @thecedarprince.bsky.social · 04/11/2025
This is pretty incredible work by @cncastillo.bsky.social! Really exciting to see #medical #imaging continue to grow within #julialang -- especially the GPU acceleration via KomaMRI.jl (link: github.com/JuliaHealth/...) Plus, the @makie.org plots look fantastic! #dataviz #academicsky
github.com
GitHub - JuliaHealth/KomaMRI.jl: Koma is a Pulseq-compatible framework to efficiently simulate Magnetic Resonance Imaging (MRI) acquisitions. The main focus of this package is to simulate general scen...
Koma is a Pulseq-compatible framework to efficiently simulate Magnetic Resonance Imaging (MRI) acquisitions. The main focus of this package is to simulate general scenarios that could arise in puls...
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Reposted by Jacob S. Zelko
Jacob S. Zelko @thecedarprince.bsky.social · 04/11/2025
I am on the job market and wanted to advertise myself here! 🤠 Looking for full-time or contracting roles! Historically, my work spans population dynamics, healthcare informatics, robust adaptive controls, software engineering, and community engagement. 🧪 #STEMjobs #academicsky #publichealth
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Jacob S. Zelko @thecedarprince.bsky.social · 04/11/2025
If my skills/background sound of interest to anyone hiring, I'd be keen to chat! Happy to pass along more details too! 📝 Feel free to drop me a comment below or a DM here on BlueSky. ✍️ Thank you so much! #jobs #contracting
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Jacob S. Zelko @thecedarprince.bsky.social · 04/11/2025
Additionally, I lead JuliaHealth & am community manager for AlgebraicJulia while serving as co-admin for Google Summer of Code for #julialang. For years, I've also been involved in @ohdsi.bsky.social and have lead health research efforts using various medical informatics methods. #medsky #mathsky
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Jacob S. Zelko @thecedarprince.bsky.social · 04/11/2025
Currently, I’m a Research Affiliate at the @usask.ca Computational Epi & Public Health Informatics Lab ⚗️ Previously worked in a dual role at the Georgia Tech Research Institute and Centers for Disease Control and Prevention, and was a Trainee Affiliate at Northeastern University’s Roux Institute. 🤓
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Jacob S. Zelko @thecedarprince.bsky.social · 04/11/2025
I am on the job market and wanted to advertise myself here! 🤠 Looking for full-time or contracting roles! Historically, my work spans population dynamics, healthcare informatics, robust adaptive controls, software engineering, and community engagement. 🧪 #STEMjobs #academicsky #publichealth
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Jacob S. Zelko @thecedarprince.bsky.social · 04/11/2025
This is pretty incredible work by @cncastillo.bsky.social! Really exciting to see #medical #imaging continue to grow within #julialang -- especially the GPU acceleration via KomaMRI.jl (link: github.com/JuliaHealth/...) Plus, the @makie.org plots look fantastic! #dataviz #academicsky
github.com
GitHub - JuliaHealth/KomaMRI.jl: Koma is a Pulseq-compatible framework to efficiently simulate Magnetic Resonance Imaging (MRI) acquisitions. The main focus of this package is to simulate general scen...
Koma is a Pulseq-compatible framework to efficiently simulate Magnetic Resonance Imaging (MRI) acquisitions. The main focus of this package is to simulate general scenarios that could arise in puls...
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Reposted by Jacob S. Zelko
JuliaAstro @juliaastro.org · 29/10/2025
Would you or your colleague like to improve the performance of your data analysis? Then please join us at our @julialang.org workshop at the 247th @aas.org meeting on Jan 3, 2026 in Phoenix, AZ. The regular registration deadline is Nov 7. aas.org/meetings/aas... #aas247 #JuliaLang #astrocode
aas.org
AAS 247: Registration | American Astronomical Society
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Jacob S. Zelko @thecedarprince.bsky.social · 23/10/2025
Be me: *Gets text notification* Friend: I did a photo shoot for a piece of chalk. Me: What? Friend: It's Hagoromo. Me: Understandable. Friend: Wanna see the photos? Me: YES. #mathsky #scisky 🧪 #academicsky
The most aesthetically pleasing photo of Hagoromo chalk I have ever seen.
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Jacob S. Zelko @thecedarprince.bsky.social · 23/10/2025
Be me: *Gets text notification* Friend: I did a photo shoot for a piece of chalk. Me: What? Friend: It's Hagoromo. Me: Understandable. Friend: Wanna see the photos? Me: YES. #mathsky #scisky 🧪 #academicsky
The most aesthetically pleasing photo of Hagoromo chalk I have ever seen.
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Reposted by Jacob S. Zelko
Jacob S. Zelko @thecedarprince.bsky.social · 20/10/2025
JuliaHealth is on @hf.co! 🤗 If you are interested in #julialang, #llm or #agentic workflows, and how #GenAI can be used within public health, medical informatics, and survey-based research, drop us a line or a follow! 🤓 How are you using GenAI in your medical research? #opensource #medsky #data
huggingface.co
JuliaHealthOrg (The JuliaHealth Organization)
Org profile for The JuliaHealth Organization on Hugging Face, the AI community building the future.
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Jacob S. Zelko @thecedarprince.bsky.social · 20/10/2025
JuliaHealth is on @hf.co! 🤗 If you are interested in #julialang, #llm or #agentic workflows, and how #GenAI can be used within public health, medical informatics, and survey-based research, drop us a line or a follow! 🤓 How are you using GenAI in your medical research? #opensource #medsky #data
huggingface.co
JuliaHealthOrg (The JuliaHealth Organization)
Org profile for The JuliaHealth Organization on Hugging Face, the AI community building the future.
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Reposted by Jacob S. Zelko
Jacob S. Zelko @thecedarprince.bsky.social · 18/10/2025
Markian & I worked with Katy Sadowski to create small OMOP CDM patient databases. We discussed a #workflow to generate 1 million patient DB that went from ~220GB to ~20GB -- ~90% data reduction! Goal was to provide researchers more realistic & performant @duckdb.org DBs for health informatics. 📊🩺
Dbt-synthea enables new workflows for resource-constrained environments
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Reposted by Jacob S. Zelko
Jacob S. Zelko @thecedarprince.bsky.social · 18/10/2025
My first time presenting on compositional public health outside a maths venue! Working on general slogans but we describe it as: "Compositional public health empowers researchers to reclaim agency through abstraction in public health." Time to run studies using AlgebraicJulia! #mathsky #julialang
Compositional public health empowers researchers to reclaim agency through abstraction in public health. More formally, "Compositional public health is an emerging field at the intersection of category theory, epidemiology, systems science, and engineering, and utilizes tools from applied category theory for public health applications."
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Jacob S. Zelko @thecedarprince.bsky.social · 18/10/2025
Great time @ohdsi.bsky.social Symposium! Shared applied category theory ideas for #publichealth, won an award on data engineering using @duckdb.org, discussed multimodal health informatics & volleyball spiked folks with inflatable globes ( ✨OHDSI✨ things). Details in 🧵 #medsky #openscience 🧪
My friend Markian Hromiak and I posing at the conference main area.Markian celebrating our poster we won an Early Stage Community Choice Award for!
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Jacob S. Zelko @thecedarprince.bsky.social · 18/10/2025
Markian & I worked with Katy Sadowski to create small OMOP CDM patient databases. We discussed a #workflow to generate 1 million patient DB that went from ~220GB to ~20GB -- ~90% data reduction! Goal was to provide researchers more realistic & performant @duckdb.org DBs for health informatics. 📊🩺
Dbt-synthea enables new workflows for resource-constrained environments
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Jacob S. Zelko @thecedarprince.bsky.social · 18/10/2025
My first time presenting on compositional public health outside a maths venue! Working on general slogans but we describe it as: "Compositional public health empowers researchers to reclaim agency through abstraction in public health." Time to run studies using AlgebraicJulia! #mathsky #julialang
Compositional public health empowers researchers to reclaim agency through abstraction in public health. More formally, "Compositional public health is an emerging field at the intersection of category theory, epidemiology, systems science, and engineering, and utilizes tools from applied category theory for public health applications."
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Jacob S. Zelko @thecedarprince.bsky.social · 18/10/2025
Great time @ohdsi.bsky.social Symposium! Shared applied category theory ideas for #publichealth, won an award on data engineering using @duckdb.org, discussed multimodal health informatics & volleyball spiked folks with inflatable globes ( ✨OHDSI✨ things). Details in 🧵 #medsky #openscience 🧪
My friend Markian Hromiak and I posing at the conference main area.Markian celebrating our poster we won an Early Stage Community Choice Award for!
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Reposted by Jacob S. Zelko
Jacob S. Zelko @thecedarprince.bsky.social · 17/10/2025
My (graduated!) #GSoC mentee, Indu, is embarking on building a platform in #julialang for public health dashboards, medical imaging, & more! 🤠 If you are in #dataviz, #rstats, #opensource, #julialang, #medsky, or science communication, plz share your thoughts on her ideas here or on this post! 🧪
discourse.julialang.org
Building a JuliaHealth-specific Genie.jl Dashboard
Hello everyone! 👋 I am currently working towards building a JuliaHealth-specific Dashboard using Genie.jl. The main idea is to have one simple, unified interface where users can: Load or connect to...
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Jacob S. Zelko @thecedarprince.bsky.social · 17/10/2025
Her project is part of JuliaHealth and you can track progress for it here! It builds upon on Genie.jl -- a native dashboarding solution in #julialang!
github.com
GitHub - JuliaHealth/HealthDash.jl
Contribute to JuliaHealth/HealthDash.jl development by creating an account on GitHub.
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