I investigate questions
with data and software.
I’m Jerry Vaughan, a data analyst in Chicago. I build small systems to study games, public transit, and other questions that benefit from careful measurement.
Current investigation
A simulation study of Rummikub strategy.
I built a rules engine, 33 explainable strategies, and a playable simulator to test which habits help across complete games.
Selected work
Other projects
Tools and experiments I maintain or use to explain how a system works.
Simulation study and playable lab
Sequence Strategy Lab
Explore nine explainable playbooks, controlled strategy experiments, scored-board heatmaps, remarkable games, and a complete browser implementation.
Read the findings or play →Mobile Sudoku
Play curated unique puzzles offline with notes, progressive hints, exact undo, local stats, and a phone-first interface.
Start solving →Interactive system
Queue Playground
Watch an asynchronous job queue scale workers, absorb bursts, retry failures, and settle back down in real time.
Run the experiment →Public data tool
CTA Transit Server
A live interface that gives AI assistants access to Chicago bus arrivals, vehicle locations, routes, and service alerts.
Explore the project →Field notes
What I’m writing down.
Hello, world
First post on my new FastAPI-powered personal site.
Contact