I have no idea how to contact them but a couple names of interest from the very early days might include...
John Troja - he was involved in the "sprocket man" cartoon book from California in the 70's & is actually the person who inspired & to some degree worked w/ Chris to build his 1st MB. He was more an idea guy, not a framebuilder & I think had aspirations of being Chris' partner. Pretty sure they parted ways soon after the 1st few bikes were built (possibly not on good terms?).
Gary Helfrich - he convinced Chris to change from brazed to welded frames, then went on to start Merlin.