Z:gnu-www-ja-rms-lisp--880b19-Guy Steele designed the origin/en

Guy Steele designed the original symmetrical Emacs command set; then he and I began implementing Emacs (on top of TECO), but after one long joint development session, Steele began drifting away, so I finished Emacs. Others particularly including Eugene C. Cicciarelli and Mike McMahon contributed substantially later on.