The opening essay of this Companion provides a chronologically organized introduction to and summary of Nietzsche's published works, while also providing an overview of their basic themes and concerns. It is followed by three essays on the appropriation and misappropriation of his writings, and a group of essays exploring the nature of Nietzsche's philosophy and its relation to the modern and postmodern world. The final contributions consider Nietzsche's influence on the twentieth century in Europe, the United States and Asia.