Philip J. Klass
Aviation journalist and the most prominent skeptical investigator of the MJ-12 documents, author of the Truman signature paste-up analysis.
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Philip J. Klass
Philip J. Klass, an aviation journalist, was the most prominent skeptical investigator of the MJ-12 documents.
His strongest contribution is specific and, in the sources retrieved, uncontested on its physical merits: that the Truman signature on the 1947 Truman-Forrestal memo is a photocopied paste-up lifted from an authentic 1 October 1947 Truman letter to Vannevar Bush, matching down to accidental scratch marks and a shared pen slip on the "H," with slight thinning where the "T" crosses the "s" in "Sincerely" suggesting retouching before copying [S1].
He also argued the Eisenhower Briefing Document's date format matches William Moore's personal habits, and — via a tip from Timothy Good — that Timothy S. Cooper's own 1991 letters share a typewriter idiosyncrasy with a purported 1952 MJ-12 document. Notably, Klass published a document examiner's caution against his own inference there, namely that elevated capitals can also result from imperfect shift-key depression by different typists [S1].
He lost at least one public technical wager to Stanton Friedman; see Cutler-Twining Memo.
Sources
[S1] "Philip J. Klass, Skeptical Inquirer (May/June 2000)" / https://centerforinquiry.s3.amazonaws.com / Accessed 2026-08-30
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