There are many people named Paul Williams on Wikipedia but I am referring to the Paul Williams who founded Crawdaddy and served as Philip K. Dick's literary executor.
The Wikipedia article gives a good summary of his achievements. Here is a piece that emphasizes his role as Dick's literary executor. Here's the article in Rolling Stone.
Because interest in Philip K. Dick tends to fuel interest in Robert Anton Wilson (and vice versa), I would argue that Williams' efforts on behalf of PKD helped keep interest in RAW alive.