MMM Mode was originally designed and written by Michael Shulman
<viritrilbia@users.sourceforge.net>.

It was inspired by mmm.el for XEmacs by Gongquan Chen <chen@posc.org>.

Recent contributors have included:

bishop <bishop@platypus.bc.ca>
Joe Kelsey <joe@zircon.seattle.wa.us>
Alan Shutko <ats@acm.org>
Michael Alan Dorman  <mdorman@users.sourceforge.net>
Brian P Templeton <plovre@users.sourceforge.net>
Yann Dirson <ydirson@fr.alcove.com>
Marcus Harnisch

and others...
