I know he worked on the second Twilight Zone + the Beauty and Beast TV show as a writer.
He also obviously wrote the source material (AKA the books) for the HBO series, but he is not the show runner(s) and I think has only scripted one episode per season (?). So 10% of the episodes so far, and none this season, so that's really 8%. They go to him for information about the world and obviously consults for his story, but.... I'm not really sure where you're getting this from. Is he really "working with people" in terms of being Directive (AKA xxxJ) as much as you are suggesting?