This book demonstrates the rich diversity and depth of political philosophy in the twentieth century. Catherine H. Zuckert has compiled a collection of essays recounting the lives of political theorists, connecting each biography with the theorist's life work and explaining the significance of the contribution to modern political thought. The essays are organized to highlight the major political alternatives and approaches. Beginning with essays on John Dewey, Carl Schmitt, and Antonio Gramsci, representing the three main political alternatives – liberal, fascist, and communist – at mid-century, the book proceeds to consider the lives and works of émigrés such as Hannah Arendt, Eric Voegelin, and Leo Strauss, who brought a continental perspective to the United States after World War II. The second half of the collection contains essays on recent defenders of liberalism, such as Friedrich Hayek, Isaiah Berlin, and John Rawls, and liberalism's many critics, including Michel Foucault, Jürgen Habermas, and Alasdair MacIntyre.