Justin Fineberg

Justin Fineberg is the co-founder and CEO of Cassidy, a New York-based platform that lets non-technical teams build AI agents and automations powered by their own company data. He got early beta access to OpenAI's GPT-3 in 2020, left a product role at Blade in 2022, and teamed up with engineer Ian Woodfill to launch Cassidy. Alongside building the company, he grew an audience of more than 400,000 followers across TikTok, Instagram, X and YouTube by explaining how AI reshapes business. Cassidy raised a $10M Series A led by HOF Capital in 2025, bringing total funding to roughly $13.7M.