# Charles Teague

> Charles Teague is a Boston-based software founder and engineer, co-founder and former CEO of Lose It!, and CEO and co-founder of Meridian Labs. His career spans Allaire and ColdFusion, Onfolio, Microsoft’s Windows Live Writer, General Catalyst, and Quarto at RStudio/Posit. In 2025 he co-founded Meridian Labs to build open-source tools for AI research and evaluation.

- **Role:** CEO and Co-founder at Meridian Labs
- **Organizations:** Meridian Labs, RAND Corporation, Posit (formerly RStudio), Lose It! (FitNow, Inc.), General Catalyst, Microsoft, Onfolio, Macromedia, Allaire Corporation
- **Education:** Bachelor of Arts in Political Science, Macalester College
- **Known for:** First employee at Allaire and later a leader on ColdFusion., Co-founded Onfolio, whose assets Microsoft acquired in 2006., Co-founded and led Lose It!, then transitioned leadership internally in 2020.

## Career timeline

- **Before 2001** — Became the first employee at Allaire, initially answering phones for $12 an hour, and progressed to product and engineering leadership on ColdFusion.
- **2001** — Allaire was acquired by Macromedia; Teague worked as a director of engineering responsible for ColdFusion.
- **2006** — Microsoft announced its acquisition of Onfolio’s assets on March 7. Teague had co-founded Onfolio with J.J. Allaire and went on to work on Windows Live Writer at Microsoft.
- **2008** — Returned from the Seattle area to Boston and became Technologist in Residence at General Catalyst. Co-founded Lose It! with J.J. Allaire and Paul Dicristina.
- **2012** — Lose It! raised a Series A and began developing its freemium business model.
- **2020** — Moved from CEO to executive chairman of Lose It! on June 16; Patrick Wetherille succeeded him as CEO.
- **2020-2022** — Joined RStudio to work on Quarto; in February 2022 he described having worked on the project for 18 months.
- **2022** — Ziff Davis announced its acquisition of Lose It! in July, following completion in the second quarter.
- **Before 2025** — Served as a Technology and Security Policy Fellow at RAND, helping develop Inspect AI.
- **2025** — Co-founded Meridian Labs with J.J. Allaire and Eric Patey; serves as CEO.
- **2026** — Co-authored the May 7 announcement introducing Petri 3.0 at Meridian Labs.

## Achievements

- First employee at Allaire and later a leader on ColdFusion.
- Co-founded Onfolio, whose assets Microsoft acquired in 2006.
- Co-founded and led Lose It!, then transitioned leadership internally in 2020.
- Worked on the creation of the Quarto scientific and technical publishing system.
- Helped develop Inspect AI and co-founded Meridian Labs in 2025.

## Latest updates

- **2026-05** — Co-authored Meridian Labs’ announcement of Petri 3.0, the first Petri release developed at Meridian.
- **2024-01** — Published posts on Quarto 1.4 and his share-post extension.

## Links

- Website: https://www.charlesteague.com/
- LinkedIn: https://www.linkedin.com/in/cteague/
- Twitter/X: https://twitter.com/dragonstyle
- GitHub: https://github.com/dragonstyle

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Profile page: https://yespress.io/charles-teague
Published by YesPress — https://yespress.io
Last updated: 2026-10-25