Zachary Brenner — Founder & JD/MBA Candidate

Zachary Brenner — Founder & JD/MBA Candidate · LegalQuants

About

Former U.S. Senate aide who traded Capitol Hill for code editors. JD/MBA candidate by day, privacy toolsmith by night. Co-founder and CEO of Sonomos, where the mission is simple: show professionals what they’re about to expose before they hit send. Written about AI, blockchain, and the law for the Journal of Regulatory Compliance, the UC Davis Business Law Journal, Law360, and Westlaw Today. Still learning. Still building.

Selected work

Sonomosflagship

Sonomos is a local-first privacy layer for professionals who use AI tools but can’t afford to expose sensitive data. Its two core features — Dagger, which detects sensitive information in real time with a traffic-light overlay, and Cloak, which masks that data before it ever leaves your machine — sit between the user and whatever AI tool they’re typing into. No cloud processing, no trust required. Built for lawyers, financial advisors, and anyone in a regulated industry who needs to use AI without violating client confidentiality. Currently running pilot programs with law firms.

Web App

Try it live ↗

Brief History

Brief History is an interactive legal research tool. Type in any action — like “terminate an employee” or “collect biometric data” — and get a visual timeline of every relevant statute, regulation, and key case mapped chronologically. Click any entry to expand details, toggle categories on and off to filter by jurisdiction or legal domain. A fast way to see the full regulatory picture around a specific action without digging through Westlaw.

Web App

Origynl

Origynl is an early-stage prototype exploring document authenticity for the AI era. It combines multi-factor AI detection with blockchain certification to prove that a file — contract, photo, record — existed at a specific moment in time, isn’t AI-generated, and hasn’t been altered since. Still rough around the edges, but the core idea is simple: a tamper-proof notary for a world where anyone can fake anything.

Web App

Try it live ↗

Glyph

Glyph is a Chrome extension that puts §, ¶, ©, ™, and 26 other symbols lawyers actually use right next to whatever text field you’re typing in — Clio, Gmail, Google Docs, wherever. One click to insert. No alt codes, no character map, no breaking your flow.

Web App

Source

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