A lot of people would disagree but I would nominate Arthur Whitney of k/q/j/apl fame; others on my list are Bill Spitzak of FLTK, Salvatore sanfillipo (antirez)

A lot of people would disagree but I would nominate Arthur Whitney of k/q/j/apl fame; others on my list are Bill Spitzak of FLTK, Salvatore sanfillipo (antirez), Richard Stillman (who hasn’t written a lot of code recently, but did write the original Emacs, GCC and a lot more)