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In 2008, Chamitoff voted from outer space; he also conducted a live-from-space satellite chat with students attending school in London.

Gregory Chamitoff on the International Space Station (ISS), early November 2008.

In July 2002, Chamitoff was a crew-member on the Aquarius undersea research habitat for 9 days as part of the NEEMO 3 mission (NASA Extreme Environment Mission Operations).

Selected by NASA for the Astronaut Class of 1998, Chamitoff started training in August 1998 and qualified for flight assignment as a Mission Specialist in 2000. He worked in the Space Station Robotics branch, was lead CAPCOM for ISS Expedition 9, acted as Crew Support Astronaut for ISS Expedition 6, and helped develop onboard procedures and displays for Space Station system operations.

In 1995, Chamitoff joined the Motion Control Systems Group in the Mission Operations Directorate at the Johnson Space Center, where he developed software applications for spacecraft attitude control monitoring, prediction, analysis, and maneuver optimization.

From 1993 to 1995, Chamitoff was a visiting professor at the University of Sydney, Australia, where he led a research group in the development of autonomous flight vehicles, and taught courses in flight dynamics and control. He has published numerous papers on aircraft and spacecraft guidance and control, trajectory optimization, and Mars mission design.

As an undergraduate student at Cal Poly, Chamitoff taught lab courses in circuit design and worked summer internships at Four Phase Systems, Atari Computers, Northern Telecom, and IBM. He developed a self-guided robot for his undergraduate thesis project. While at MIT and Draper Labs (1985–1992), Chamitoff worked on several NASA projects. He performed stability analyses for the deployment of the Hubble Space Telescope, designed flight control upgrades for the Space Shuttle autopilot, and worked on the attitude control system for Space Station Freedom. His doctoral thesis developed a new approach for robust intelligent flight control of hypersonic vehicles.

Gregory Errol Chamitoff (born 6 August 1962 in Montreal, Quebec, Canada) is an engineer and former NASA astronaut. He has been to space twice, spending 6 months aboard the ISS across Expedition 17 and 18 in 2008, and another 15 days as part of STS-134 in 2011. STS-134 was the last of Space Shuttle Endeavour which delivered the Alpha Magnetic Spectrometer and completed the US Orbital Segment.

Chamitoff was born 6 August 1962 in Montreal, Quebec, Canada to a Jewish family of Russian origin. He was inspired to become an astronaut after watching the moon landing at the age of six.