As described by an attendee, Robert Gaskins [0], who would later invent PowerPoint:

This meet-up was initiated by Kevin Kelly and Stewart Brand, and designed by Lee Felsenstein, Bill Budge, Andy Hertzfeld, and Doug Carlston, timed to coincide with the publication of Steven Levy’s book Hackers: Heroes of the Computer Revolution.

Stewart Brand claimed that the invitees were “the most interesting and effective body of intellectuals since the framers of the U.S. Constitution,” a claim that escaped criticism from those attending. Invitees paid a flat $90 for the weekend, including conference, round-the-clock food and drink, and dormitory bunks. Steve Wozniak donated $5,000 for videotaping, and scraps of footage from the weekend later became a DVD [1]. The t-shirt design was by Don Knuth’s student Scott Kim [2].

[0] https://www.robertgaskins.com/

[1] https://www.amazon.com/gp/product/B0009RS0EM/qid=1149603344/...

[2] https://web.archive.org/web/20131031125056/http://scottkim.c...