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For certain areas of mathematics a tongue-in-cheek suggestion is Jean Bourgain. Reading and understanding all his papers is an almost impossible task, but if you manage it, then you'll almost certainly end up a superb mathematician.
Nice implied prompt: "In [your profession], which single author's work would, if understood in detail, ensure that you were superb at that profession?" For theoretical physics, Feynman is too dated now, but you'd be pretty good.
I think, it's Witten now.
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