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EJ Cho and the work left between the tools
Before Tofu, Eunjoon “EJ” Cho discovered that building a product meant learning a second profession: getting anyone to notice it. His answer grew out of the awkward spaces between marketing tools.
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.