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Human Spaceflight Center

Experienced Leadership

The Human Spaceflight Center at Sierra Space is the foundation for our astronaut corps and our Astronaut Training Academy.

Dr. Thomas Marshburn

Chief Medical Officer

Dr. Tom Marshburn serves as Chief Medical Officer for Sierra Space, leading the medical team for the Human Spaceflight Center and Astronaut Training Academy. He is responsible for the human health of Sierra Space’s corps of our Career, Specialist, and Experiential astronauts.

Before joining Sierra Space, Dr. Marshburn served 28 years at NASA, where he was a veteran of three spaceflights, STS-127, Expedition 34/35, and Expedition 66/67 as part of Crew-3.  Prior his selection as an astronaut in 2004, Dr. Marshburn served as a Flight Surgeon for the Space Shuttle Medical Operations and the joint U.S./Russian Space Program. He also served as Medical Operations Lead for the International Space Station and piloted the NASA SpaceX Crew-3 mission to the International Space Station.  Marshburn was a flight engineer on Expedition 66 and commander of Expedition 67. He spent 337 total days in space over his career and over 24 hours on spacewalks.

Dr. Marshburn is the recipient of NASA Superior Achievement Award, the Space and Life Sciences Division Special Space Flight Achievement Award twice, and the Lyndon B. Johnson Space Center Superior Achievement Award.

Tom  holds a Bachelor of Science in Physics from Davidson College, North Carolina, a Masters in Engineering Physics from the University of Virginia, a Doctorate of Medicine from Wake Forest University, and a Masters in Medical Science from the University of Texas Medical Branch.

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