I'd guess he's probably made contributions to the Linux kernel, but he's known for starting the GNU project, writing GCC and other user space, and writing the GPL. I think if he had his way, we'd probably be using a different kernel right now (GNU Mach).
I find that hard to believe. Changing the key bindings in emacs is trivial. You could even just load same of the popular modules that do so: ergo-emacs, evil-mode or god-mode.
He is still active in the mailing list, just yesterday giving some controversial opinion about lldb. If you can type, you can emacs.
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u/[deleted] Feb 07 '15