Summary
Simon Kalouche is the founder and CEO of Nimble Robotics, which builds general-purpose warehouse robots and operates autonomous fulfillment centers. Before starting Nimble, he invented the low-cost quasi-direct-drive (QDD) actuator as a Carnegie Mellon master’s student — a design later adopted across the legged and humanoid robotics industry, from MIT’s Mini Cheetah to Unitree’s quadrupeds and humanoids — and left a robotics PhD at Stanford to commercialize what he had learned about imitation learning for robot manipulation.
Career
Kalouche earned a B.S. with honors in mechanical engineering from The Ohio State University in 2014, minoring in entrepreneurship and innovation, and won Ohio State’s Outstanding Undergraduate Research Award and first place at the university’s Denman Undergraduate Research Forum (Ohio State College of Engineering). He went on to earn an M.S. in Robotics from Carnegie Mellon University’s Robotics Institute in 2016 as a National Defense Science and Engineering Graduate (NDSEG) Fellow, where his master’s thesis introduced the quasi-direct-drive (QDD) actuator: a design pairing a high-torque-density brushless motor with a low-ratio, single-stage gearbox that preserves backdrivability and force transparency while multiplying torque, built almost entirely from low-cost, off-the-shelf drone motors and gearboxes at roughly one-tenth the cost of comparable actuators at the time. He validated the design in GOAT, a three-degree-of-freedom jumping and running legged robot capable of 82-centimeter vertical jumps, and separately co-created the Snake Monster, a modular reconfigurable legged robot built from series-elastic actuators, winning the Best Applied Paper Award at IEEE SSRR in 2015 (Simon Kalouche personal website). During this period he also worked on dynamic legged robots for the U.S. Department of Defense, International Space Station robotics for NASA’s Jet Propulsion Laboratory, and autonomous off-road vehicles for the Air Force Research Laboratory (Ecom Logistics Podcast).
Kalouche’s QDD design proved influential well beyond his own thesis: because its low gear ratio keeps friction, backlash, and reflected inertia low, it can be modeled accurately in physics simulators, making it a practical hardware foundation for the sim-to-real reinforcement learning pipelines that now underlie most dynamic legged and humanoid robot locomotion. He has noted that MIT’s Mini Cheetah (2019), Unitree’s Go1/A1 quadrupeds and H1/G1 humanoids, and other widely used platforms adopted the same low-cost QDD actuation principle he introduced in 2016, and has said Amazon founder Jeff Bezos once contacted him after apparently browsing his master’s thesis online (Simon Kalouche personal website).
After his master’s, Kalouche began a Ph.D. in robotics at Stanford, joining the Vision and Learning Lab under Professor Fei-Fei Li (and advised in part by Ken Salisbury), where his research focused on deep imitation learning for robot manipulation using data from VR teleoperation and upper-body exoskeletons, alongside self-supervised learning and sim-to-real transfer. He has said it was this imitation-learning research — the realization that a robot could learn to generalize a manipulation task from a few hundred or thousand teleoperated demonstrations, rather than requiring it to be explicitly programmed — that convinced him to leave academia and build a company around the idea. He left his Ph.D. program in 2017 to found Nimble Robotics, building on that imitation-learning approach and his own QDD actuator work to develop a general-purpose warehouse robot (Ohio State College of Engineering; Forbes).
As Nimble’s CEO, Kalouche has led the company through four funding rounds to a $1 billion valuation and a strategic alliance with FedEx, recruiting a board of AI and robotics figures that includes his former Stanford advisor Fei-Fei Li, Boston Dynamics founder Marc Raibert, and Google X/Waymo founder Sebastian Thrun. He was named to Forbes’ 2021 “30 Under 30” list in Manufacturing & Industry, and received Ohio State’s Texnikoi Outstanding Alumni Award in 2024. His robotics research has been covered by the Wall Street Journal, Forbes, TechCrunch, IEEE Spectrum, The Verge, and Wired.
Source Notes
This profile draws on Simon Kalouche’s personal website (including his own technical writeup and publication list on quasi-direct-drive actuators), his LinkedIn profile, a Forbes “30 Under 30” profile, an Ohio State College of Engineering Q&A, and an Ecom Logistics Podcast interview. His exact birth year is not confirmed in available sources and has been intentionally left blank rather than estimated. Some biographical claims on this page, including an anecdote about entrepreneur Jeff Bezos reviewing his master’s thesis, are self-reported by Kalouche and have not been independently corroborated.