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Re:Is Email Making Professors Stupid? by RachelF on Friday February 22, 2019 @01:22AM (#19223538)
His website [1] claims he is retired. He goes on to saying how he is like a hermit and needs long batches on un-interrupted time. Worth a look, he's an interesting fellow.

1: https://www-cs-faculty.stanford.edu/~knuth/retd.html

Re:Is Email Making Professors Stupid? by gnicholas on Friday February 22, 2019 @01:25AM (#19223549)
Emeritus is basically retired. You have continued access to university resources, but little/nothing is required of you. Source: my wife happens to be a professor at the same university.