In memory of the man who put red and green squiggles under words

This article pays tribute to Tony Krueger, a long-time Microsoft developer responsible for the iconic red and green spell-check squiggles in Word. It highlights his technical contributions to making software features more unobtrusive for users.
Why it matters
It highlights the often-unseen human labor behind ubiquitous software features that define modern digital literacy.
I recently learned of the passing of someone whose work nearly everybody knows, but nobody knows his name.
The content is a biographical tribute and technical history with no political or social bias.
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