I met Doug Engelbart in the late 90's during his reboot sessions at Stanford. Lots of luminaries spoke, including Ted Nelson.
I was there because I read every one of his group's papers, in the mid 80's, and wrote a version of Augment in MS-DOS and Turbo Pascal. I think I showed him a demo.
He invited me to attend informal meetings at SRI. I left after a few weeks because I couldn't figure out how it would result in a product. Had already went into deep personal debt, once before (about $50K in 1990), trying to market something similar.