John F. Schuessler.
documentedsource_actorLandmark High-Strangeness Cases
[DOCUMENTED] NASA/McDonnell-Douglas aerospace engineer and MUFON co-founder/director; principal investigator of the Cash-Landrum case for decades. Authored 'The Cash-Landrum UFO Incident' (1998). Notably, his own Geiger-counter check of Cash's car found no radioactivity.
Schuessler is the Cash-Landrum analog to Hynek-as-investigator: a credentialed engineer who championed the case while also surfacing inconvenient null results (no detectable radiation on the vehicle). His files underpin most later accounts.