Dr Joseph Markel Prahl American Payload Specialist Astronaut. Born 30 March 1943. Personal: Male, Married, Two children. Born in Beverly, Massachusetts, USA. PhD Bachelor of arts in engineering from Harvard College, 1963. Master of science and Ph.D. in mechanical engineering from Harvard College, 1968. Astronaut Career Astronaut Group: Payload Specialist. Inactive Entered space service: 5 August 1990. Left space service: 9 July 1992. Assigned as backup for STS-50. Professor of Engineering, Case Western Reserve University, Cleveland, Ohio. Squash, sailing, music, classical guitar. Bibliography and Further Reading - Becker, Joachim, http://www.spacefacts.de/, "Space Facts Web Site", . Joachim Becker's outstanding collection of facts and photos of astronauts and cosmonauts. Accessed at: http://www.spacefacts.de/.
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