Whose point of view is The Great Gatsby told from?

The Great Gatsby is told from the point of view of Nick Carroway.  He is from the Midwest, but narrates the story after it takes place in the East.  As such, he is an outsider, and tends to judge what he experiences in the East based on his midwestern ideas and values. 

Nick makes an effort to assure the reader that he is nonjudgmental and completely honest.  This is ironic, because he is very judgmental and opinionated.  He is an unreliable narrator. 

Nick, in the process of telling the reader Gatsby's story, reveals the underbelly of the Jazz Age and the American Dream, the impossibility of recapturing the past, the tendency for humans to try to recapture the past, the difference between illusion and reality.