# Brennan Spellacy

> Brennan Spellacy is the CEO and co-founder of Patch, a climate technology company connecting businesses with carbon credits and environmental markets. A McGill chemical engineering graduate and former Shopify programmer and Sonder product and engineering operator, he co-founded Patch with Aaron Grunfeld in 2020. His work focuses on the software, data, distribution and expertise needed to turn climate commitments into procurement and project finance.

- **Role:** CEO and co-founder at Patch
- **Organizations:** Patch, Sonder, Shopify
- **Nationality:** Canadian and American (self-described dual citizen)
- **Education:** Bachelor’s degree; studied chemical engineering, McGill University
- **Known for:** Co-founded Patch in 2020 with Aaron Grunfeld., Led Patch through its $55 million Series B in 2022., Helped build product and engineering teams at Sonder before founding Patch.

## Career timeline

- **Before 2020** — Studied chemical engineering at McGill, then worked as a programmer at Shopify and in product and engineering at Flatbook/Sonder.
- **2020** — Co-founded Patch with former Sonder colleague Aaron Grunfeld; dates his return to climate tech to April 2020.
- **2021** — Patch announced a $4.5 million seed round led by Andreessen Horowitz.
- **2022** — Patch announced a $55 million Series B led by Energize Ventures on September 13.
- **2023** — Patch launched CarbonOS for carbon credit suppliers on April 13.
- **2025** — Announced Patch’s end-to-end buyer platform on April 24; described a plan to pursue profitability in October.
- **2026** — Published July essays on AI-assisted climate work and coordinated environmental instrument procurement.

## Achievements

- Co-founded Patch in 2020 with Aaron Grunfeld.
- Led Patch through its $55 million Series B in 2022.
- Helped build product and engineering teams at Sonder before founding Patch.
- Oversaw expansion from API-based carbon purchases into supplier software and an end-to-end buyer platform.

## Latest updates

- **2026-07** — Published Sustainable growth is a solvable problem on July 7, arguing for AI-assisted reduction of operational friction while retaining expert judgment.
- **2026-07** — Published How to evolve your carbon program into a multi-instrument climate strategy on July 15.
- **2025-10** — Discussed pursuing profitability and reducing cash burn as carbon-market funding tightened.
- **2025-10** — Appeared on The Hard Part with Evan McCann, discussing Sonder, Patch and carbon markets.
- **2025-04** — Announced the public launch of Patch’s end-to-end buyer platform.

## Links

- Website: https://www.patch.io/
- LinkedIn: https://www.linkedin.com/in/bspellacy
- Twitter/X: https://twitter.com/bspellacy_
- GitHub: https://github.com/bspellacy

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Profile page: https://yespress.io/brennan-spellacy
Published by YesPress — https://yespress.io
Last updated: 2026-10-24