Gosling also developed a version of Emacs back in the early 1980s.
https://en.wikipedia.org/wiki/Gosling_Emacs
"Gosling Emacs was especially noteworthy because of the effective redisplay code, which used a dynamic programming technique to solve the classical string-to-string correction problem. The algorithm was quite sophisticated; that section of the source was headed by a skull-and-crossbones in ASCII art, warning any would-be improver that even if they thought they understood how the display code worked, they probably did not."