Carnegie Mellon University
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Ralph Hollis
Research Professor, RI
Office: EDSH 121
Phone: (412) 268-8264
  Mailing address:
Carnegie Mellon University
Robotics Institute
5000 Forbes Avenue
Pittsburgh, PA 15213
Administrative Assistant: Christine Downey
Affiliated Center(s):
 Magnetic Levitation Haptic Consortium (Maglev)
 Center for the Foundations of Robotics (CFR)

News and Media
Omnidirectional Mobile Robot Has Just Two Moving Parts
October 04, 2016. More than a decade ago, Ralph Hollis invented the ballbot, an elegantly simple robot whose tall, thin body glides atop a sphere slightly smaller than a bowling ball. The latest version, called SIMbot, has an equally elegant motor with just one moving part: the ball. The only other active moving part of the robot is the body itself. Its spherical induction motor (SIM) eliminates the mechanical drive systems used on previous ballbots and is less likely to suffer mechanical failures.
Faculty Will Share Visions Of Robots, A.I., and Big Data at “Summer Davos”
September 03, 2015. Carnegie Mellon University is sending the largest delegation of any university to the World Economic Forum’s Annual Meeting of the New Champions in Dalian, China, next week, along with robots and Big Data visualization demonstrations that will run throughout the three-day event.
Bossa Nova Develops Commercial Version of Ballbot
October 23, 2012. Bossa Nova Robotics, a company founded by Robotics Institute PhD alumnus Sarjoun Skaff, announced Oct. 23 at the RoboBusiness Leadership Summit that it is producing mObi, the first commercially available robot that uses a unique locomotion technology pioneered by the Robotics Institute’s Ralph Hollis in his Ballbot robot.
Ballbot : A Single-Wheeled Balancing Robot

September 10, 2015 - Length: 7:16