Andrew S. Tanenbaum Alive
Wrote MINIX to teach OS design — the code a young Torvalds bought a PC specifically to run — and authored the standard textbooks.
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Created MINIX
Wrote MINIX (1987) — the teaching OS that inspired Linux — and 'Operating Systems: Design and Implementation.'\n\nThe Tanenbaum–Torvalds debate (1992) is computing's most famous Usenet argument; his textbooks taught the field.