Robert Louis "Bob" Behnken (born July 28, 1970 in Creve Coeur, Missouri) is a United States Air Force officer, NASA astronaut and former Chief of the Astronaut Office.
Behnken holds a Ph.D in Mechanical Engineering and holds the rank of Colonel in the U.S.
Air Force.
Col.
Behnken has logged over 1,000 flight hours in 25 different aircraft.
He flew aboard Space Shuttle missions STS-123 (2008) and STS-130 (2010) as a Mission Specialist, accumulating over 708 hours in space, including 37 hours of spacewalk time.
Behnken was also assigned as Mission Specialist 1 to the STS-400 rescue mission.