"Michael Landon Gernhardt"@en . . . "Gernhardt, Michael L."@en . "American astronaut" . "1956Z"^^ . "Active" . . "3.74046e+06"^^ . "Michael Landon Gernhardt (Ph.D.) (born May 4, 1956, in Mansfield, Ohio) is a NASA astronaut and manager of Environmental Physiology Laboratory and principal investigator of the Prebreathe Reduction Program (PRP) at the Lyndon B. Johnson Space Center."@en . . . . "1956-05-04Z"^^ . .