Robert Nozick

Robert Nozick (November 16, 1938 – January 23, 2002) was an American political philosopher. His best known work is "Anarchy, State, and Utopia" (1974). It responds to "A Theory of Justice", a book by John Rawls.
Politically, Nozick was a libertarian. He believed that the government should protect property and resolve contractual disputes but not much else. Nozick also created the thought experiment of the experience machine.