Roger Boisjoly, the principal engineer on the Thiokol O-ring task force, and Arnold Thompson were the most knowledgeable experts on O-rings in the U.S.

Aerospace engineer Roger Boisjoly, who warned that launching NASA's space shuttle Challenger in cold weather could be disastrous, has died of cancer at the age of 73.

The night before the 1986 explosion, Boisjoly and four others argued that joints in the shuttle's boosters couldn't withstand a cold-weather launch.

For anyone of TV viewing age in January 1986, the image of the space shuttle Challenger exploding over the Atlantic just moments after liftoff is an indelible one. And as many have long known, the ...

Two men, Bob Ebeling and Roger Boisjoly, knew the fate of the Challenger months before its tragic launch, yet NASA went ahead with the mission.

Roger Boisjoly, who has died aged 73, was an engineer whose warnings of catastrophe were ignored on the eve of the Challenger Space Shuttle disaster, which killed seven crew members, including the ...

Roger Mark Boisjoly 1938-2012 NEPHI, UTAH — Our beloved Roger Mark Boisjoly’s time on earth has ended. He passed away January 6, 2012, in Nephi, Utah, after a courageous battle with can… ...

Roger Boisjoly, a NASA contractor who repeatedly voiced concerns about the space shuttle Challenger before it exploded, has died. He was 73.

Roger Boisjoly was an engineer at solid-rocket booster manufacturer Morton Thiokol and had begun warning as early as 1985 that the joints in the boosters could fail in cold weather, leading to a ...

Engineer Roger Boisjoly examines a model of the O-Rings, used to bring the Space Shuttle into orbit, at a meeting of senior executives and academic representatives in Rye, New York in Sept. 1991.