# Andy Cook

> Andy Cook is the Boston-based co-founder and CEO of Tettra, a knowledge management company he started with childhood friend Nelson Joyce in 2015. Previously a co-founder and CTO of Rentabilities and a product manager at HubSpot, he has written publicly about founder-led sales, fundraising, and building a sustainable software business.

- **Role:** Co-founder & CEO at Tettra
- **Organizations:** Tettra, HubSpot, Rentabilities, NanaGram
- **Education:** University of Massachusetts Amherst
- **Known for:** Co-founded Rentabilities, acquired by HubSpot in 2013., Co-created Leadin inside HubSpot., Co-founded Tettra in 2015.

## Career timeline

- **2010–2013** — Founder and CTO of Rentabilities, working with brother Alex Cook.
- **2013** — Rentabilities acquired by HubSpot; Cook joined HubSpot.
- **2013–2015** — Worked with Nelson Joyce on Leadin inside HubSpot.
- **2015** — Co-founded Tettra with Nelson Joyce.
- **2018** — Published a detailed account of a $590,000 fundraise lasting 193 days.
- **2023** — Introduced Kai, Tettra’s AI knowledge assistant.
- **2024** — Announced Tettra’s acquisition of Supportman.
- **2025** — Participated as a maker in Guidemaker’s Product Hunt launch.

## Achievements

- Co-founded Rentabilities, acquired by HubSpot in 2013.
- Co-created Leadin inside HubSpot.
- Co-founded Tettra in 2015.
- Completed approximately 150 phone demos to win Tettra’s first 50 customers.
- Published fundraising details including 75 investors approached and 25 commitments in Tettra’s 2018 round.

## Latest updates

- **2024-11** — Announced Tettra’s acquisition of Supportman and plans to explore AI-assisted support feedback and coaching.
- **2023-08** — Introduced Kai, designed to answer questions from existing company knowledge and route missing answers to experts.

## Links

- Website: https://tettra.com/
- LinkedIn: https://www.linkedin.com/in/andygcook
- Twitter/X: https://twitter.com/AndyGCook

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Profile page: https://yespress.io/andy-cook
Published by YesPress — https://yespress.io
Last updated: 2026-10-15