Marc Raibert

Marc Raibert is the American roboticist who founded Boston Dynamics — the man who proved that machines could move like animals, and then spent 30 years making it real.

If you've ever watched a video of a robot doing a backflip or running like a dog, the line traces back to Raibert.

The Leg Lab

Raibert earned his PhD from MIT in 1977 and joined Carnegie Mellon as a professor in 1980. He started the CMU Leg Laboratory with a heretical idea: instead of building robots with three or four legs that move slowly and statically (the standard approach at the time), build robots with one leg that hop, like a pogo stick. Then two legs. Then four.

The argument was that dynamic balance — falling slightly forward and catching yourself with your next step, the way humans actually walk — was both easier and more capable than static balance. Each individual moment doesn't have to be stable; only the rhythm has to be.

He moved the lab to MIT in 1986. The MIT Leg Lab produced a series of legendary robots: the 3D Hopper (1985), the planar biped (1989), the quadruped (1990) — each one moving more like an animal than anything that had come before.

Boston Dynamics

In 1992, Raibert spun the lab out as a private company. For most of the next two decades, Boston Dynamics ran on military research contracts, building proof-of-concept machines that were not yet products but were technical milestones:

• BigDog (2005) — a four-legged robot that could carry 50 kg over rough terrain. The famous video of someone kicking it and watching it slip and recover went viral and is, by a wide margin, the moment dynamic legged locomotion entered public awareness.
• Cheetah (2012) — set the speed record for legged robots, hitting 46 km/h on a treadmill.
• PETMAN (2011) — the first humanoid Raibert's company built, designed to test chemical protective suits.
• Atlas (2013) — the humanoid that became the symbol of modern robotics.

The handoff

In 2019, Raibert stepped down as CEO of Boston Dynamics, handing the role to Rob Playter — a 25-year veteran of the company who had been the engineering lead on most of its products. Raibert moved into the role of executive chairman.

In 2022, he founded The AI Institute — a new research lab funded by Hyundai (which had just bought Boston Dynamics), focused on the harder, longer-term problems of intelligent robotics: cognition, manipulation, learning. It's essentially his MIT Leg Lab, restarted, with deeper pockets.

What he believes

Across his interviews and talks, two ideas come up again and again:

Animals are the best teachers. A cheetah running, a cat falling, a goat balancing on a cliff — these are existence proofs that legs can be incredibly capable. Engineers should study biology, not just calculus.

Hardware is harder than software. Software you can iterate in a day. Hardware you iterate in months. He's spent his career arguing that the bottleneck in robotics is not algorithms but the physical machines those algorithms run on.

Why this matters for everyone

Without Raibert, modern humanoid robotics would not exist in its current form. Every company building a humanoid today — Tesla, Figure, 1X, Agility, Unitree, Apptronik — is, knowingly or not, building on the foundation he laid: that machines can move like animals, that dynamic balance beats static balance, and that the right engineering target isn't industrial repetition but biological grace.

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Curious about the company he built? Read Boston Dynamics.