I read one of his most celebrated works: "Slaughterhouse Five" while in Brother Tom's Lit class in High School. The imagery of it has stayed with me in the form of a crown of white yellow over the shadow edges of ornate buildings. A visual Haiku. It is the novelization of Mr. Vonnegut's direct experience of the fire-bombing of Dresden.
Here is a thorough piece on this one of a kind American author from the LA Times.
And another from Myway.
Rest in Peace Mr. Vonnegut.