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Were they outsiders to the community, or outsiders with respect to the necessary knowledge? [Genuinely curious: this is a cool example -- thanks for posting.]
Total outsiders to the community. And not experts in what people thought was the relevant knowledge (it wasn't). I saw a talk on it, which was fascinating, by someone who'd written a book about it. But I never read the book.
It's easy to find other examples. John Sidles at UW has done this kinda thing several times. One example: I believe @dabacon told me that Sidles had found some kinda bug in the way LIGO approached gravitational wave detection. He's trained as a doctor.
He also co-invented magnetic force resonance microscopy. Just a very curious, imaginative person, who sometimes beats the experts at their own game.
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