Guion Stewart Bluford, Jr., Ph.D. (born November 22, 1942), (Col, USAF, Ret.), is an American aerospace engineer, retired U.S. Air Force officer and fighter pilot, and former NASA astronaut, who was the first African American in space. Before becoming an astronaut, he was a Colonel in the U.S. Air Force. He participated in four Space Shuttle flights between 1983 and 1992. In 1983, as a member of the crew of the Orbiter Challenger on the mission STS-8, he became the first African American in space as well as the second person of African ancestry in space, after Cuban cosmonaut Arnaldo Tamayo Méndez.