Joon Sung Park

Joon Sung Park is the CEO and Co-founder of Simile, a Stanford-spinout AI company that raised $100M Series A in February 2026 to build digital twins that simulate human behavior and predict consumer decisions. A PhD in Computer Science from Stanford (2025), Park pioneered the concept of 'generative agents' - AI actors with memory, reflection, and planning capabilities - through a landmark 2023 paper that earned a Best Paper Award at UIST and became one of the most-cited works in HCI. Before launching Simile, he was an oil painter trained in hyper-realism, a background that infuses his research with a rare sensitivity to what makes humans human. His digital-twin platform has already signed CVS Health and Telstra as customers, and his model correctly forecast 8 out of 10 questions asked at a real earnings call.