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A request: I suspect a lot of people are recommending people whose work they mostly haven't read. Please only suggest, say, Richard Hamming or David Deutsch, if you've read in detail much of their work, including many of their technical papers.
For me, Ivan Illich and Seymour Papert are strong examples. And IMO share an interesting characteristic: even when they’re wrong, they way they’re wrong and the places their wrongness leads offer a lot of insight.
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