Margaret Rhea Seddon, born November 8, 1947 in Murfreesboro, Tennessee, is one of the first group of astronauts to include women and is a veteran of three space shuttle flights. She has a doctorate of medicine from the University of Tennessee and has served in hospitals in Mississippi and Tennessee.
Selected as an astronaut in 1978, her first mission was aboard Discovery (STS-51-D) in April 1985 as mission specialist. She logged 168 hours in space.
Her second mission was aboard Columbia (STS-40) in June 1991 as mission specialist. This flight was dedicated to life sciences with experiments involving cardiovascular/cardiopulmonary, renal/endocrine, blood, musculoskeletal, neurovestibular and immune systems.
Her third and final mission was aboard Columbia (STS-58) in October-November 1993 as Payload Commander on another life science research mission, continuing many of the experiments began on STS-40.
She is married to former astronaut Robert Gibson.
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