J.D. Salinger is the greatest author
He's my personal favorite.
Catcher In The Rye is an outstanding book, I think I read it about a million times (in both Russian and English). It's written in the teen spirit and he definitely knew that people'd love it, as he'd written about real life. Most of the conversations are in slang and this fact, I think, wides Salinger's readers.
But after all, Catcher In The Rye isn't the best of his, IMO. The most powerful and thoughtful is Teddy.