Thomas begins by clarifying and defending Nagel's basic metaphysical contrast between subjective and objective ways of thinking about the world. He shows how a proper understanding of radically perspectival views of the world allows one to defend some of Nagel's most important claims about the mind, tracing his influential work in the philosophy of mind from his early paper on physicalism to his recent defence of a form of dual aspect theory. Thomas then turns to ethics, where Nagel's influence is pre-eminent, following the development of his views from his contrast between subjective and objective reasons in his early work to his later hybrid ethical theory. The volume concludes with an examination of Nagel's political philosophy, particularly his recent controversial work on global justice.