Michael L. Gernhardt, born May 4, 1956 in Mansfield, Ohio, is a veteran of four space shuttle flights and three missions to NASA's Aquarius underwater laboratory.
His first mission was as mission specialist on Endeavour (STS-69) in September 1995, NASA's 100th successful manned spaceflight.
His second flight, also as mission specialist was on Columbia (STS-83) in April 1997, but the mission was cut short due to a problem with a fuel cell.
His third mission was STS-94 on Columbia in July 1997. This was the "reflight" of STS-83, which was cut short.
His fourth flight was on Atlantis (STS-104) in July 2001 to the International Space Station. He conducted three EVAs during the mission.
In April 2005, he commanded NEEMO 8, in NASA's Aquarius underwater laboratory. NEEMO stands for NASA Extreme Environment Mission Operations. His second mission underwater was for NEEMO 15, when he piloted the DeepWorker submersible, a small submarine which is a "stand-in" for a Space Exploration Vehicle that may one day explore an asteroid.
Most recently, he piloted hte DeepWorker submersible during NEEMO 16, for which he was principal investigator.
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