Gerard Ziemski // halfmarble cofounder // bio platform architect
I am not building for a market. I am building for a race. Whether it's hardware to stabilize a trembling hand or software to track the science behind cellular repair — these are the mechanics of survival.
A high-stability SMD soldering aid designed to dampen tremors. Born from the need to keep tinkering when biology tries to stop it. Open-source because community is the only way forward.
A pharmacokinetic visualizer that models the blood concentration curves of the medication schedule your doctor prescribed. Half-life math shows how your levels rise and fall in real-time — not to tell you what to take, but to help you and your clinician see what is already happening. The Bridge: PK validates what you can feel (ON/OFF states), building trust for the autophagy states you can’t.
A technical solution for a biological war. This isn’t a lifestyle app; it’s a specialized fasting engine grounded in the latest autophagy research. The science is the engine — we just built the dashboard.
A specialized metabolic intake engine built on the Therapeutic Carbohydrate Restriction (TCR) guidelines championed by the Public Health Collaboration UK. This is not a diet app. It is a precise macro-nutrient tracker designed to help patients induce the therapeutic nutritional ketosis required to fuel a neuro-compromised brain, while monitoring protein timing to prevent levodopa interference at the blood-brain barrier.
Harvard Medical School / Beth Israel Deaconess Medical Center // Boston
halfmarble is officially registered for the DCI Network's Patients 2026 Conference in Boston. We are bringing our "Glass Box" architecture to the clinical informatics community to demonstrate how patient-engineered PK visualizations can safely capture the "Messy Middle" of Real-World Evidence (RWE) that researchers need, with zero AI drift.
halfmarble was not built by a health tech company. It was built by a patient and a nurse — because the tools we needed did not exist. We are coming to Patients 2026 to find out if the clinical community wants what we have built.
Every field we capture. Every transformation we apply. Every "we will never." Documented, public, plain language.
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"My wife and I are building this because I have Parkinson's Disease. Halfmarble is not a startup. It's a fight."
A nurse and a programmer. We built this. Just us.
Halfmarble donates 5% of net profits to the organizations whose research our tools stand on. Not charity in the abstract — reinvestment in the intellectual commons we depend on.
Scales to 10% (5% each) automatically once halfmarble reports $250,000 in annual net profit. Permanent from that point forward.
Annual donations published. Legally codified. Non-negotiable.
Honors bachelor's degree in software engineering from Western University in 1998, plus two years toward an M.Sc. — dropped out to join Apple. Twenty-five years writing software. New Media Lab. Apple. Sun Microsystems. Oracle. Two patents along the way. Early open source contributor to gl4java and jogl — Java bindings for OpenGL — back when Java on the desktop still felt like the future.
Diagnosed with Parkinson's Disease over 10 years ago. Halfmarble is the engine built out of necessity to fight it.
Born in Poland. Educated in Canada. Cut my teeth in Silicon Valley. Now building halfmarble from Charlottesville, Virginia.
Off the clock: hiking, kayaking, books and games, tinkering with microcontrollers, and love for the company of dogs.
Nursing education and training in the United States. Fourteen years as a nurse. Most of them caring for geriatric patients — the population hit hardest by chronic disease, medication complexity, and the day-to-day reality of living with conditions that don't get better. Known to my employer and co-workers as a fierce patient advocate.
Born and raised in Ukraine. Volunteer as an English-to-Russian interpreter for immigration cases. Now building halfmarble from Charlottesville, Virginia.
Off the clock: cooking healthy meals for my family, hiking, and kayaking.