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Joon Park

Co-Founder & CEO, Simile

Search every verified Joon Park interview, podcast appearance, and on-the-record quote — each transcript cross-checked by AI and human review to confirm speaker identity. Joon Park, co-founder and CEO of Simile, recently discussed the company's work on AI models that simulate human behavior at two industry events. At ICONIQ Frontier in October 2026, he described how Simile builds "foundational models" that predict individual and population-level responses to products, messaging, and policies. He cited research from Stanford involving roughly 1,000 American participants, whose digital twins matched their real-world survey and behavioral responses with over 85% accuracy. Park also noted that Simile currently works with enterprise clients including CVS, Gallup, and others, and that the company collects data from tens of millions of real human subjects to train its models. In a separate September 2026 appearance, Park traced Simile's origins to a 2023 Stanford project called Smallville, which used generative AI to create a simulated town of 25 autonomous agents. He said the team later demonstrated that such agents could accurately predict individual behavior, leading to the founding of Simile. Park stated that about 50% of Fortune 100 companies are either working with Simile or in its sales pipeline, and that the company's long-term vision includes simulating entire societies of 8 billion people. He also emphasized that Simile's tools aim to shorten the time and cost of traditional surveys and experiments, allowing companies to test counterfactual scenarios in a computational environment.

Recent appearances

  • Simile's Joon Sung Park on using AI to model human behavior at 85% accuracy

    October 08, 2026 · 📺 ICONIQ

    At ICONIQ Frontier, Joon Sung Park, CEO of Simile, shared how the company is building models that predict how people will behave in a given environment. The approach grew out of Joon’s research at Stanford. He studied roughly 1,000 Americans, using hours of interview and behavioral data to build a digital twin of each participant. Two weeks later, the real participants and their twins completed the same surveys and behavioral studies. The twins matched their responses at more than 85%. Simile now combines interview, survey, and behavioral data to model both individuals and populations, with…

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  • Joon Sung Park - Simile

    September 23, 2026 · 📺 Founders You Should Know

    Simile builds models of human behavior that let companies simulate how real populations will respond to products, pricing, messaging, and other decisions.

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  • Simulating Humanity: from Generative Agents to 8 Billion Digital Twins — Joon Sung Park, Simile AI

    August 21, 2026 · 📺 Latent Space

    Next episode → Language Agents: From Reasoning to Acting, with Shunyu Yao and Harrison Chase:    • Language Agents: From Reasoning to Acting ...   From creating Smallville, the landmark Generative Agents experiment that showed AI characters could remember, plan, socialize, and develop emergent behaviors, to now building foundation models of human behavior, Joon Sung Park is trying to answer a much bigger question: what if we could simulate the world before making decisions in it? In this episode, the Simile co-founder and CEO joins us to unpack the path from generative agents to digital twins…

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  • The AI Company Simulating the Entire Economy | Simile Co-founder & CEO, Joon Sung Park

    August 01, 2026 · 📺 20VC with Harry Stebbings

    Joon Sung Park is the Founder and CEO of Simile, the AI simulation company building foundation models of human behaviour; allowing companies to test how real people may think, decide and act before making a decision in the real world. Simile has now raised $300 million in total, including a $200 million Series B announced last week at a $2 billion valuation, led by Greenoaks and Index Ventures. ----------------------------------------------- Timestamps: 00:00 Intro 01:26 The Valentine's Day Simulation That Put Joon on the Map 03:56 How Agents Got Memory, Planning & Reflection — The Origin St…

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  • Indexing Humanity: A Fireside With the Simulation Company | Simile | RAISE Summit 2026

    July 22, 2026 · 📺 RAISE Summit

    Joon Sung Park, CEO & Co-Founder of Simile, joins Sahir Azam, Partner at Index Ventures, on indexing humanity — simulating human behaviour with AI agents. Recorded live on the Grace Hopper Stage at the Carrousel du Louvre, Paris, on July 9, 2026. RAISE Summit is Europe's leading AI gathering, bringing together 9,000+ founders, executives, investors, researchers and policymakers. Learn more: https://www.raisesummit.com Subscribe for every session from RAISE Summit 2026.

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  • Simulating Humans at Scale: Simile's Joon Sung Park

    June 16, 2026 · 📺 Sequoia Capital

    The race to build superintelligence is producing models that keep getting better at objective problems, but not at behaving like actual people. Joon Sung Park, founder and CEO of Simile and creator of Stanford's "Smallville" generative agents study, argues that simulating human society requires a fundamentally different kind of model. He frames today's frontier models as the "CPU of intelligence"—rational, superhuman at problems with right answers—and Simile as creating the "GPU of intelligence," built to encode the diversity of people's values, preferences, and tastes. It simulated 1,000 Amer…

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  • From Stanford Lab to Series A: Believing, Building, and Scaling with Joon Sung Park (Simile AI)

    May 05, 2026 · 📺 Startup Grind

    Most companies start with a market. This one started with a research paper. Joon Sung Park (CEO + Co-founder of Simile AI) left Stanford with a conviction most people couldn't see yet, and he and his co-founders turned it into a platform that enterprises are actually buying. This is the unfiltered story: the early belief, the fundraise, the first customers, and what it really takes to go from academic insight to something that scales. With Julia Hornstein (Venture Capital + Startups Reporter at The Information). This was filmed at our annual flagship Conference in Silicon Valley. Check out up…

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  • AI Startup Aims to Predict Human Behavior

    February 12, 2026 · 📺 Bloomberg Tech

    AI startup Simile has raised $100 million to help companies predict human behavior, including by guessing items customers might purchase and questions that might get asked on earnings calls. Joon Park, Simile co-founder and CEO, joins Caroline Hyde and Ed Ludlow on “Bloomberg Tech.” -------- Like this video? Subscribe to Bloomberg Technology on YouTube:    / @bloombergtech     Watch the latest full episodes of "Bloomberg Technology" with Caroline Hyde and Ed Ludlow here:    • 'Bloomberg Tech' With Ed Ludlow Full Episodes     Get the latest in tech from Silicon Valley and around the wor…

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  • The future of generative AI agents with Joon Sung Park

    February 20, 2024 · 📺 Foundation Capital

    Welcome to “AI in the Real World"! I’m your host, Joanne Chen, a General Partner at Foundation Capital, where I work closely with startups that are reshaping business with AI. In this series, I’ll be holding in-depth discussions with leading AI researchers. Together, we’ll explore how state-of-the-art AI models are being applied in the real world. To kick things off, I'm excited to speak with Joon Sung Park, a Ph.D. student in computer science at Stanford. Joon works at the intersection of human-computer interaction, natural language processing, and machine learning. He's best known for his…

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  • Generative Agents: Interactive Simulacra of Human Behavior - Joon Sung Park (Stanford)

    August 24, 2023 · 📺 Center for Language & Speech Processing(CLSP), JHU

    ... the simulation but while taking a walk in Johnson Park Sam runs into Latoya and they introduce themselves Latoya tells him that ...

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  • New Ideas in AI: Agents, their role, and viability in today’s world with Joon Sung Park

    July 11, 2023 · 📺 Scale Venture Partners

    In June 2023, we hosted Joon Sung Park, who discussed his much-discussed Generative Agents paper. Joon's work pushes the boundaries of thought on what AI can achieve, suggesting a future where AI is more interactive, personalized, and contextually aware. His observations, however, also pushed us to think about the practical implications of agents in the real world and the challenges that remain.

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  • The Future Of Human AI Interaction | Joon Park | Simulations Summit 2023

    June 30, 2023 · 📺 Founders, Inc. Rewind

    Join us at Simulations Summit 2023 presented by Virtual Beings Summit to hear Joon Park, Ph.D. student at Stanford, talk about his research work on generative agents and how they interact by demoing his custom built game world Smallville. Joon:   / joon_s_pk   ​Subscribe to our main channel for weekly vlogs: @fdotinc Join our Twitter community:   / fdotinc   Founders, Inc. is where founders build epic companies.

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The summary and quote tags on this profile are produced with AI assistance from verified, first-person interview transcripts, then checked by our team to confirm the speaker's identity and the accuracy of every quote. See how we verify →