Jacob S. Zelko
🤓: Applied Math & Biomed Engineer; Research Affl @usask.ca
🔎: Health informatics, public health, applied cat. theory & open source/science
📝: EN/ES/DE/AR
🌐: Blog @ https://jacobzelko.com
📹: Twitch @ twitch.tv/thecedarprince
- Reposted by Jacob S. ZelkoProof Without Content xkcd.com/3201/
- 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 🧪 🛟 📊🩺
- Reposted by Jacob S. ZelkoIf 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
- 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 👇
- 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.
- Reposted by Jacob S. ZelkoTwo 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...
- 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 🧪 🛟 🩺📊
- If you want to know the details of our grant, here is our full proposal: github.com/numfocus/sma...
- 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
- 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. 📊🩺
- 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
- 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
- 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
- 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. 🤓
- 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
- 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
- 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
- Blog post explaining how I drew the Julia logo using spins and an MRI scanner! 🪄🧲 #JuliaLang #MRI cncastillo.github.io/BlochHole/po...
- Reposted by Jacob S. ZelkoWould 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
- 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
- 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
- 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 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
- 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. 📊🩺
- 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! 🧪
- 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!
- Proud of GSoC mentee, Indu, for finishing her fellowship with JuliaHealth on: - Interface for multimodal & public health informatics - Easing PLP with OMOP CDM DBs Excited! Leads to robust prediction pipelines & stronger collaborations in #julialang! Details 👇 #medsky #opensource 🧪 #academicsky
- Fun news! 🤠 Was accepted to the "Formal Scientific Modeling: A Case Study in Global Health" Workshop @ American Institute of Mathematics! 🥳 Will be in Pasadena exploring category theory tools for decision support & modeling in pandemic science. 🧪🔎 Questions? Let me know! #mathsky #academicsky 🛟🩺
- BlueSky friends! If you work with paradata ("data about processes"), where would you try submitting a paper about paradata & public health? Have some notes that can be a paper; wondering what a good journal or conference would be. TY! #academicsky #knowledge #health 🧪 CC @ihuvila.bsky.social
- Thanks @chrisrackauckas.bsky.social & Michael for having me! Fun & good conversation! 🤗 If you liked the segments about: - Applied Category Theory in Health Research - Building JuliaHealth Infrastructure - Data preservation - Getting started in #julialang Feel free to reach out! 🤓 #mathsky 🧪 🛟🩺
- #Julialang Dispatch: we welcome Jacob Zelko, who takes us on a fascinating journey from his early days as a #biomedical engineering student through his work at the CDC during the COVID-19 pandemic, and into his current exploration of applied #categorytheory. www.youtube.com/watch?v=HyMp...
- 🔎 Temporal graph theory (dynamic graphs) is nifty 🤯 Introduced by Wilmer Leal & learned more from Aurora Rossi + @carlolucibello.bsky.social's work on GraphNeuralNetworks.jl @juliacon.bsky.social. 🧠 I want to read more; suggestions? ❓How do you track graph changes? #mathsky #graph #learning 🧪
- That's a wrap for @juliacon.bsky.social 2025 for me! 💥 Great meeting JuliaHealth folks in person, having our first-ever Mini-Symposium, & planning for the ecosystem! Thanks to all who attended! Ready to recharge & build #opensource! P.S. Snagged our annual #julialang @frame.work group photo too!
- Go @cncastillo.bsky.social! Love the work of KomaMRI.jl -- currently the bleeding edge of Magnetic Resonance Imaging work! For those in medical #imaging, please check out the package! 🤯 juliahealth.org/KomaMRI.jl/s... #julialang #opensource
- @juliacon.bsky.social? Let's chat a/b: 🛟 JuliaHealth - using #julialang in public #health & precision #medicine 🤓 AlgebraicJulia - computational applied category theory framework 🛠️ Hardware - #raspberrypi hacking and programming Grab me and let's get hacking! 🥷 🖥️ #opensource #openscience 🧪
- Made a public dev log of using #julialang and a #raspberrypi to make an e-ink dash! 💻 Feel free to join in the adventure! 🤠 Doing this to log my discoveries and thoughts. ⚗️ Who knows? Maybe there can be a bunch of E-Ink Julia dashboards floating around the world soon! 😁 #hacking #hobby #dataviz
- After half a year of hobby #hacking, got an eink interface working w #julialang! 🎉 Now: tidy code & docs @ github.com/TheCedarPrin... Future: custom dashboard making via @makie.org for - UV Index 🌞 - Boston Sailing Info ⛵ - todo.txt Todo List 📝 - Google Calendar 🗓️ - 🤯 #maker #raspberrypi
- After half a year of hobby #hacking, got an eink interface working w #julialang! 🎉 Now: tidy code & docs @ github.com/TheCedarPrin... Future: custom dashboard making via @makie.org for - UV Index 🌞 - Boston Sailing Info ⛵ - todo.txt Todo List 📝 - Google Calendar 🗓️ - 🤯 #maker #raspberrypi
- If you are a #maker or #hobby #programmer, what other sorts of modules can you think of? Open to ideas and suggestions about what has been useful or informative to you!
- Finished a great week at the International Conference on Applied Category Theory! 🤓 Made great connections, reconnected w old friends, and came away w new ideas! Our talk on ACSets was a success - excited a/b the future of compositional data science & public health! 💥 #mathsky #academicsky 🧪
- If you're interested in our work, here's our slides! 📈 Eager to wrap up the work in AlgebraicJulia and to finish up a paper describing a unified "Data Fabric" in the language of Attributed C-Sets. 📝 We are aiming initial applications in the world of public health! 🛟 #medsky 📊 #opensource
- Gainesville was so much fun too! Tons of hiking, some dancing, and great little city to explore! 🕺 Here are some fun photos! #nature #dancing
- Reposted by Jacob S. ZelkoI'm gonna be repping #julialang in tonight's Viz Buzz competition! please stop by and show your support! let's Makie.jl some noise 😈
- 🛫 Heading to the 2025 International Conference on Applied Category Theory next week! 🧪 Sharing on category-theoretic methods for data science, the developing field of compositional public health & ways to get involved! 🤝 Respond or DM if you want to meet up! #mathsky #academicsky #medsky
- This looks spectacular! Wish I could go! If you are an #opensource dev, fan of #julialang #python or #rstats, love #dataviz and #openscience, this will be the PERFECT place for you!
- The week of September 29th, Paris will become the epicenter of #opensource scientific computing, with a great series of events. This rare alignment creates the perfect opportunity to visit and join a vibrant community of developers, maintainers, and users! Check this out (links in thread) ⬇️
- Reposted by Jacob S. ZelkoHello Friends! I'm on the job market now! I have a oodles of knowledge for all the software performance engineering tricks in Rust, Julia and other systems languages and would love to work with teams that are looking to skill up in those respects, from back ends to big data crunching!
- My mentee, Kosuri L Indu, just finished writing a blog series on Patient Level Prediction workflows within #julialang! Our approach is inspired from OHDSI (Dr. Jenna Reps's work in particular), #rstats, and precision medicine going from phenotype definitions to real world evidence! 🧪 🛟🩺 #MLSky
- In the series, we explored how possible it is to do PLP within Julia. Good news: Julia's composition is killer; we get deep functionality for ✨ free ✨ Bad news: workflows are still rough Hopeful news: we are building ergonomic tools to make PLP easier and lots of long-hanging fruit available!
- For the past year, I have been co-PI of a cardiooncology research study on 35 million patients using Julia methods for PLP. If you are @juliacon.bsky.social this year, you'll get to hear more! Learned a lot & excited about publishing and developing more research software for PLP! #academicsky
- ❓for math friends: How long do you spend studying maths each week on average? This includes reading theory, discussing/working problems, & reviewing material. 😵💫 Doing some independent studies and it can be hard to gauge "where one is at." 🤔 LMK in comments -- thanks! 🤗 #mathsky 🧪 #academicsky
- Be me: Programming in #julialang for half a decade. Write #opensource software & help across ecosystems. Present at multiple JuliaCon's & other science conferences. Forget what the reserved word "continue" does. 🤦♂️ We are winning so hard today. 🏆 🧪
- Reposted by Jacob S. ZelkoIll be giving a minicourse for the next three weeks at the Topology, Geometry and Physics seminar tomorrow at 9am EST on my notes “Coverages and Grothendieck Toposes” (arxiv.org/abs/2503.20664), see www.zeinalian.com/workshop for more info!
- A great joy of mentoring is when your mentee *nails it* 🤸♂️ My mentee, Param Thakkar, prototyped a local #LLM RAG architecture + vector database index in #julialang for health informatics. He's even pioneering LLM guardrails in Julia w NVIDIA's NeMo! 👐 My reaction: 🤯 Follow for more 👇 #opensource
