responsible for the overall information architecture, and for balancing clarity, depth vs. breadth, target audience needs, consistency, etc.
Editorial Board
responsible for un-hiding hidden assumptions, and for making reasonable partitions between topics
Chapter Authors
a few folks with subject matter expertise, and maybe one or two who specialize in the tone and voice of OGM, or who are shadowing the main authors to gain experience, or whatever.
responsible for evolving the chapter(s) they maintain, based on OGM discussions
Technical Publishing Team
responsible for setting up and maintaining the publishing architecture