# Eunjoon Cho

> Eunjoon (EJ) Cho is the co-founder and CEO of Tofu, a San Mateo AI platform that automates personalized, multichannel B2B marketing at scale. A Stanford PhD who trained speech-recognition neural networks at Google and worked at Meta, Affirm and Fast, Cho spent years mapping the generative-AI landscape before ChatGPT opened the door. He started Tofu with Honglei Liu and Elaine Zelby in 2023, raised about $17M from SignalFire, Index Ventures and HubSpot Ventures, and grew revenue 12x in roughly a year by replacing the bloated stack of point tools marketers juggle with one platform that ships finished assets.

- **Role:** Co-Founder & CEO at Tofu
- **Organizations:** Tofu, Meta (Facebook), Affirm, Fast, Bolt Communications, Google, Stanford University
- **Nationality:** United States
- **Education:** PhD, Electrical Engineering, Stanford University
- **Known for:** Co-founded and leads Tofu, an AI marketing platform serving enterprises like Check Point, Fastly, Bluecore, RingCentral, DeepScribe and Wunderkind, Raised approximately $17M from SignalFire, Index Ventures, HubSpot Ventures and others, Grew Tofu revenue 12x in roughly a year after launch

## Career timeline

- **2013** — Joined Google's speech team, training neural networks to transcribe human speech
- **2018** — Founded Bolt Communications to fix speech-recognition error correction; market proved too narrow
- **2020** — Joined Meta (Facebook) as an engineer during the pandemic; met future co-founder Honglei Liu
- **2021-2022** — Worked across roles (including Affirm and Fast) while mapping the generative-AI market
- **2023** — Co-founded Tofu with Honglei Liu and Elaine Zelby; raised $5M seed led by Index Ventures
- **2025** — Raised $12M Series A led by SignalFire; ~$17M total raised, 12x revenue growth

## Achievements

- Co-founded and leads Tofu, an AI marketing platform serving enterprises like Check Point, Fastly, Bluecore, RingCentral, DeepScribe and Wunderkind
- Raised approximately $17M from SignalFire, Index Ventures, HubSpot Ventures and others
- Grew Tofu revenue 12x in roughly a year after launch
- Trained speech-recognition neural networks at Google before large language models had that name
- Earned a PhD in Electrical Engineering from Stanford

## Latest updates

- **2025-02** — Tofu raised a $12M Series A led by SignalFire, with HubSpot Ventures, Tau Ventures and Correlation Ventures participating; ~$17M total raised and 12x revenue growth.

## Links

- Website: https://tofuhq.com
- LinkedIn: https://www.linkedin.com/in/ej-makes-tofu
- Twitter/X: https://twitter.com/Tofu_HQ
- YouTube: https://www.youtube.com/watch?v=JGYkqhfnaU0

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Profile page: https://yespress.io/eunjoon-cho
Published by YesPress — https://yespress.io
Last updated: 2026-06-12