found: Washington post WWW site, viewed March 25, 2021(in obituary dated March 10, 2021: Allan J. McDonald, a rocket scientist and whistleblower who refused to sign off on the launch of the Challenger space shuttle over safety concerns and, after its explosion, argued that the tragedy could have been averted had officials heeded warnings from engineers like himself, died March 6 in Ogden, Utah. He was 83. Mr. McDonald was in Cape Canaveral, Fla., at NASA's Kennedy Space Center, where the Challenger was set to take off. He was the senior on-site representative of his company, contractor Morton Thiokol, where he oversaw the engineering of the rocket boosters used to propel the shuttle into space. Allan James McDonald was born on July 9, 1937, in Cody, Wyo. Mr. McDonald received a bachelor's degree in chemical engineering from Montana State University in 1959, then joined what was then Thiokol Chemical Corp. In 1967, he received a master's degree in engineering administration from the University of Utah)