James Detweiler

Two years ago, @pyetras and I started @3rddimensionai with a simple conviction: the future of simulation would be grounded in reality. Only then could autonomous systems be validated in sim, at scale. Today, I’m excited to share that @3rddimensionai is being acquired by @Rivian The real world is incredibly complex, with a long tail of rare events that makes validation nearly impossible at scale. Instead of trying to recreate that complexity by hand, we believed we could start with reality itself — reconstruct the world from sensor data, then make it controllable, editable and generative. Over the last two years, we built that technology and assembled one of the most incredible teams working in spatial AI. Rivian is a natural fit for our next chapter. It was a competitive process, but we ultimately chose Rivian for four reasons: - The product is simply incredible. - We’ll be 100% focused on our original thesis: how do we use simulation to validate autonomy at scale? We’ll get to put what we’ve built directly in the loop with real vehicles, real-world data and an autonomy stack. - The Rivian team is incredibly ambitious. This already shows in the quality of the vehicles, and the autonomy available to date. - James has built a no nonsense, first principles team focused on the task at hand. On a more personal level, I’ve long admired @RJScaringe grit and determination as a founder, and I’m looking forward to learning from him. There are so many people who got us here. @pyetras, my co-founder, has been an incredible partner from day one, and never stopped pushing our vision forward and the bar higher technically. Christian, our Chief Researcher, elevated how we think about research and what we should be ambitious enough to tackle. And the entire @3rddimensionai team: many of you left bigger, more established, better-funded companies to take a chance on this. I can’t thank you enough. I’m incredibly proud of this team, and very happy that we get to stay together and keep doing what we love. As a first-time founder, I’m incredibly grateful for the backing of our investors. Their support gave me the confidence to take risks, set ambitious goals, and be honest when something wasn’t working. @asenkut @DetweilerJames at @felicis gave us the backing and legitimacy to think much bigger. Fouad at @Soma_Capital wrote me my first check as a founder. The teams at @MVP_Ventures and @AbstractVC rode out the highs and lows and rolled up their sleeves when we needed them. Thank you. And to my wife, @clairekart , and all the partners and families behind our team: startups have a way of becoming part of your lives whether you signed up for them or not. Thank you for the late nights, the uncertainty, and all the times the company came home with us. I’m confident this next chapter is a positive one for our employees and their families. Finally, thank you to @RJScaringe, James, Ben and everyone at @Rivian for believing in the team and what we’ve built. We have a lot to do. I’m excited to get started. techcrunch.com/2026/10/22/ri…

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