Who wrote the novel "The Man in the High Castle"?

The "Man in the High Castle" is a hit series on Amazon, but it was originally a novel written by American writer Philip K. Dick. Dick is known for exploring philosophical, social, and political themes in his novels, and his plots are often dominated by authoritarian governments like the government in "The Man in the High Castle." Other elements that can be seen in Dick's plots are monopolistic corporations, alternate universes, and altered states of consciousness.