<Tr> <Td_colspan="2"> Project manager of the solid fuel boosters of the Shuttle Program System </Td> </Tr> <P> Roger Mark Boisjoly (/ boʊʒəˈleɪ / boh - zhə - LAY; April 25, 1938--January 6, 2012) was an American mechanical engineer, fluid dynamicist, and an aerodynamicist . He is best known for having raised strenuous objections to the launch of the Space Shuttle Challenger the day before the loss of the spacecraft and its crew in January 1986 . Boisjoly correctly predicted, based on earlier flight data, that the O - rings on the rocket boosters would fail if the shuttle launched in cold weather . </P> <P> Boisjoly studied mechanical engineering at the University of Massachusetts Lowell . He worked for companies in California on lunar module life - support systems and the moon vehicle . He later worked for Morton Thiokol, the manufacturer of the solid rocket boosters (SRBs) for the Space Shuttle program . </P> <P> Boisjoly wrote a memo in July 1985 to his superiors concerning the faulty design of the solid rocket boosters that, if left unaddressed, could lead to a catastrophic event during launch of a Space Shuttle . Such a catastrophic event did occur less than a year later resulting in the Space Shuttle Challenger disaster . </P>

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