Simulating futures
to build the one we want.

I build open-source software that computes what the law says, measures what it does, and projects what happens next.

CEO, The Axiom Foundation & PolicyEngine · Washington, DC

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Rules what the law says — exact, cited, computable

Impacts what it does — for any household, for whole populations

Projections what happens next — modeled openly, revised as law changes

Work

Founder & CEO · 2026—

The Axiom Foundation

Publishes the law as open, verified code — every value citing its statute, every clause carrying its effective date, every encoding checked against independent implementations. Launches publicly July 28; PolicyEngine becomes its first and most demanding consumer.

axiom-foundation.org →

Co-founder & CEO · 2021—

PolicyEngine

Free, open-source software that computes taxes and benefits for any household and simulates reforms across whole populations. Policymakers, researchers, and benefit navigators use it in the US, UK, and Canada.

policyengine.org →

PolicyBench

Open benchmark scoring AI models on tax and benefit law, graded against exact calculations.

Populace

Calibrated survey microdata for policy simulation — national to local, fully reproducible.

OpenMessage

macOS Google Messages client that gives coding agents access to your texts.

MacKenzie Scott's giving, in QALYs

GiveWell-style Monte Carlo model of $26.3B in giving, running entirely in your browser.

microdf

Pandas extensions for weighted survey microdata, used across PolicyEngine's models.

TerminalGrid

VS Code extension for keyboard-driven terminal grids, built for agentic coding.

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Writing

Nov 2, 2026 What eight AI forecasters expect from DC's foie gras vote Before DC's November 3 vote, eight AI forecasters, each researching alone, give Initiative 86 an 89.7% chance of passing and expect passage to make further farmed-animal measures likelier. They also predict whether the ban survives and what happens to menus and liver pâté. Oct 20, 2026 Testing California's bond funds against the billionaire tax odds Prediction markets have priced California's Proposition 40 for almost a year, and a fund of California municipal bonds has not moved with the odds by any amount I could detect. Before November 3, I registered a test that pools ballot measures across states. Sep 20, 2026 What do forecasters say they don't know? Professional forecasters in the US and euro area have reported full probability distributions for decades. I pooled every one into a tracker and two working papers, and read what they say about growth in the AI era. Jul 5, 2026 A year of ChatGPT is a fifth of a beer I built an interactive that prices drinks in AI queries — and lets you flip the accounting scope and the workload unit that make published AI water numbers differ by 100x.

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Research

2024 Enhancing survey microdata with administrative records Microsimulation dataset construction. Presented at NTA 2024. 2025 What can LLMs tell us about the ETI? With Jason DeBacker. How language models perceive behavioral responses to tax policy.

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