Reading his books is often a life-changing experience for people. I recommend them, but they aren't for everybody. Tread with caution...
However, he is best known as the guy who wrote "Fear and Loathing in Las Vegas" and the character that Jonny Depp played in the movie was Hunter's alter-ego.
There were a couple of other movies based on his life... and a running character in Doonsbury (Uncle Duke) was based on him.
He was the leading counter-culture icon for several generations.
Native XWA.Netter (Nutter?)