"Robert Anton Wilson, if you’re unaware, was something of a countercultural Gandalf, a white-haired wizard of skepticism and subversion. Wilson lived a remarkably diverse life, becoming, at various times, a novelist, essayist, philosopher, polymath, psychologist, editor, playwright, psychonaut, futurist, civil libertarian, Discordian Saint, and self-described agnostic mystic. A mouthful, I know—the man got shit done."
From an essay, "Reality Tunnels & E-Prime: A Taste of Robert Anton Wilson," by Jordan Bates that came out in 2014. I missed it at the time, so I'm linking to it now.
See also his "12 Books That Destroyed and Rebuilt My Mind," which includes Cosmic Trigger.