Harry Mellsop

159 posts

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Harry Mellsop

Harry Mellsop

@HarryMellsop

Founder @ Antioch — we’re building integration testing for atoms. Formerly CTO @TransposeData (acq. by @Chainalysis), AI @ Tesla, Stanford.

Manhattan, NY เข้าร่วม Mart 2020
295 กำลังติดตาม115 ผู้ติดตาม
Harry Mellsop
Harry Mellsop@HarryMellsop·
If your stack is thin and idempotent, agent spam works. For everyone else, intentional abstraction layers are as important as ever, and the complexity of atomic graph traversal and mutation is still the relevant ‘law of physics’.
Sherwood@shcallaway

OVERRATED: running tons of agents in parallel; working on too many things at once; perpetual context-switching; opening lots of low-quality PRs that may never land. UNDERRATED: using one or two agents at a time; focusing on the task in front of you; thinking deeply; finishing stuff; making your code works in prod.

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andrew chen
andrew chen@andrewchen·
hot take :) The biggest and most productive people in the AI era are the folks who are already good at their jobs. AI as a multiplier, not an equalizer/democratizer
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Sherwood
Sherwood@shcallaway·
OVERRATED: running tons of agents in parallel; working on too many things at once; perpetual context-switching; opening lots of low-quality PRs that may never land. UNDERRATED: using one or two agents at a time; focusing on the task in front of you; thinking deeply; finishing stuff; making your code works in prod.
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Kevin Hartz
Kevin Hartz@kevinhartz·
Excited to lead the seed and partner with @HarryMellsop, @AlexLangshur, and the @antiochrobotics team. Antioch is building the simulation platform for physical autonomy, where engineers can build, test, and refine systems the way we do software. If physical AI scales the way we expect, this will redefine how robotic systems are built.
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Ian Andrews
Ian Andrews@IanAndrewsDC·
Congratulations to friends @antiochrobotics on their fundraising news today: techcrunch.com/2026/04/16/thi… Being able to deliver scaled & accurate simulation will directly accelerate progress of all robotic systems. Love that they’re building on @nvidia Omniverse
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Antioch
Antioch@antiochrobotics·
Antioch is bringing agentic development to physical autonomy. The next wave of AI will transform physical industry — manufacturing, logistics, construction — the way LLMs have changed knowledge work. To unlock this shift, every autonomy team needs the same closed-loop, agentic development infrastructure that tools like Cursor have brought to software. Last week, we announced Antioch’s $8.5M seed raise to build this. Read about the full vision, the team behind it, and what’s next: antioch.com/blog/seed/
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Menlo Times
Menlo Times@menlotimes·
Antioch @antiochrobotics Raises $8.5 Million to Bring “Software-Speed” to Physical Autonomy Development. Antioch, the cloud simulation platform for robotics and autonomy, led by Harry Mellsop @HarryMellsop, Alex Langshur @AlexLangshur, Colton Swingle @colton_swingle, Collin Schlager, and Michael Calvey @michaeljcalvey, has raised $8.5 million led by A* and Category Ventures @Category_VC, with other investors including MaC Venture Capital @MaCVentureCap, Abstract, Box Group @BoxGroup, Icehouse Ventures @IcehouseVenture, and angel investors including Shyam Sankar @ssankar (CTO, Palantir) and Adrian Macneil @adrianmacneil (CEO, Foxglove).
Menlo Times tweet media
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Traded: Venture Capital
Traded: Venture Capital@TradedVC·
Antioch, a New York–based startup building simulation tools for robot developers, has raised an $8.5 million seed round at a $60 million valuation, led by A* and Category Ventures, with participation from MaC Venture Capital, Abstract, Box Group, and Icehouse Ventures. Co-founded by Harry Mellsop, the company is focused on closing the “sim-to-real” gap in physical AI by enabling developers to train and test robots in high-fidelity virtual environments, reducing reliance on costly real-world data collection and positioning itself as a “Cursor for physical AI.” FOUNDERS: Harry Mellsop, Alex Langshur, Colton Swingle & Collin Schlager INVESTORS: A*, Category Ventures, MaC Venture Capital, Abstract, Box Group & Icehouse Ventures ROUND: Seed AMOUNT: $8,500,000 VALUATION: $60,000,000 HQ: New York #VentureCapital #Antioch #HarryMellsop #AlexLangshur #ColtonSwingle CollinSchlager TradedVC
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Jordan Windmueller
Jordan Windmueller@jhwindmueller·
We've loved working with @HarryMellsop, @AlexLangshur, and the team at @antiochrobotics since it was only an idea. Simulation has long promised to solve one of autonomy's core problems: the real world is too slow, too costly, and too constrained to capture the scale, edge cases, and adversarial conditions needed to build and validate systems that actually work. With maturing sim/physics engines, emerging world models, VLAs, etc., that promise is finally being kept -- and Antioch is the platform that puts it within reach of every autonomy team.
Antioch@antiochrobotics

We’ve raised $8.5M in seed funding, valuing Antioch at $60M, to build the simulation platform for physical autonomy. The raise was led by @Category_VC and @A_StarVC, with participation from @MaCVentureCap, @AbstractVC, @BoxGroup, @IcehouseVenture, and angels. Antioch brings robotics and autonomy development entirely into simulation. Teams build, iterate, and test their full autonomous stacks in a single platform, accelerated by agents with native understanding of 3D environments. We're doing for physical autonomy what coding agents have done for software development. When the entire development loop lives in simulation, engineers and agents can reason about a robotic stack the same way they reason about a codebase: run it, observe the result, and iterate. The funding will go toward further expanding the engineering team, the core simulation infrastructure, and our new agentic framework. TechCrunch covered the raise and what we’re building: techcrunch.com/2026/04/16/thi… If you’re an exceptional engineer interested in redefining autonomy development, we’d love to chat: antioch.com/careers.

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villi
villi@villi·
Thrilled to be supporting @antiochrobotics on their mission to build the simulation platform to bring testing and validation for robotics and autonomy from the physical world into software. Incredible team!
Antioch@antiochrobotics

We’ve raised $8.5M in seed funding, valuing Antioch at $60M, to build the simulation platform for physical autonomy. The raise was led by @Category_VC and @A_StarVC, with participation from @MaCVentureCap, @AbstractVC, @BoxGroup, @IcehouseVenture, and angels. Antioch brings robotics and autonomy development entirely into simulation. Teams build, iterate, and test their full autonomous stacks in a single platform, accelerated by agents with native understanding of 3D environments. We're doing for physical autonomy what coding agents have done for software development. When the entire development loop lives in simulation, engineers and agents can reason about a robotic stack the same way they reason about a codebase: run it, observe the result, and iterate. The funding will go toward further expanding the engineering team, the core simulation infrastructure, and our new agentic framework. TechCrunch covered the raise and what we’re building: techcrunch.com/2026/04/16/thi… If you’re an exceptional engineer interested in redefining autonomy development, we’d love to chat: antioch.com/careers.

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Bennett Siegel
Bennett Siegel@BennettSiegel·
We knew we had to be in business with @HarryMellsop, @AlexLangshur and the team at @antiochrobotics as soon we met them. They are a second time, highly technical group of founders with deep expertise in robotics. The physical AI revolution will be multiples larger than what we’ve seen with LLMs. By shifting development and evaluation of autonomous systems out of the physical world and into simulation, Antioch is empowering hardware teams to ship product at software-speed. We’re excited to lead their seed round. techcrunch.com/2026/04/16/thi…
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alex langshur
alex langshur@AlexLangshur·
Excited to share that we've raised $8.5M in seed funding for @antiochrobotics, led by @A_StarVC and @Category_VC, with participation from @MaCVentureCap, @AbstractVC, @BoxGroup, @IcehouseVenture, and a group of angels we're lucky to have behind us. A year ago, @HarryMellsop, @colton_swingle, @CollinSchlager, @michaeljcalvey, and I started Antioch with a conviction that simulation would become the foundation of how autonomous systems get built and tested. We'd all seen the same thing from different vantage points: teams building fake warehouses and running expensive field trials, spending months calibrating simulated sensors and physics to match real-world behavior, and wrestling with tools like Isaac Sim and Gazebo that were built for researchers, not production engineering teams. We're using the raise to double down on what we think the future of this space actually looks like: autoresearch for physical autonomy. Coding agents work because the feedback loop is tight: write code, run it, observe the result, iterate. Physical autonomy hasn't had that loop because you can't spin up a warehouse on every commit. Simulation gives you exactly that runtime, and we're building the agentic layer on top of it: Antioch lets AI agents reason about robotic systems the same way coding agents reason about a codebase. Onboard a stack, calibrate high-fidelity digital twins, compose dynamic environments, run thousands of scenarios in parallel, and iterate, all without touching hardware.
Antioch@antiochrobotics

We’ve raised $8.5M in seed funding, valuing Antioch at $60M, to build the simulation platform for physical autonomy. The raise was led by @Category_VC and @A_StarVC, with participation from @MaCVentureCap, @AbstractVC, @BoxGroup, @IcehouseVenture, and angels. Antioch brings robotics and autonomy development entirely into simulation. Teams build, iterate, and test their full autonomous stacks in a single platform, accelerated by agents with native understanding of 3D environments. We're doing for physical autonomy what coding agents have done for software development. When the entire development loop lives in simulation, engineers and agents can reason about a robotic stack the same way they reason about a codebase: run it, observe the result, and iterate. The funding will go toward further expanding the engineering team, the core simulation infrastructure, and our new agentic framework. TechCrunch covered the raise and what we’re building: techcrunch.com/2026/04/16/thi… If you’re an exceptional engineer interested in redefining autonomy development, we’d love to chat: antioch.com/careers.

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Michael Calvey
Michael Calvey@michaeljcalvey·
> boarding flight > no starlink dish sad
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ค้นพบ

@AlexLangshur @antiochrobotics @nvidia @colton_swingle @michaeljcalvey @Category_VC @MaCVentureCap @BoxGroup