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.