That's maybe not the ideal endorsement, though. Ken is a great guy, but having the trivia champion of the world saying he is an enthusiastic Emacs user... well, it doesn't improve Emacs' reputation as an editor for lovers of the esoteric.
Whitfield Diffie is also an Emacs user. I once sat behind him at an awards ceremony and was able to observe him hacking on Emacs lisp during the event. That was the highlight of my month.
Yes. After the event was over, I asked him what he had been working on, it was some code to identify what sort of buffer he had just opened (secure v. insecure, I don't remember the details)
Eben Moglen is also not there - sure he's now a Stallman collaborator and involved with the FSF, but he is 'just' a lawyer and/or law professor - yet in one of his earliest contacts with RMS, he apparently already claimed to use emacs every day.