Book excerpt: In Eros and Revolution, Javier Sethness Castro presents a comprehensive intellectual and political biography of the world-renowned critical theorist Herbert Marcuse (1898-1979). Investigating the origins and development of Marcuse's dialectical approach vis-à-vis Hegel, Marx, Fourier, Heidegger, and Freud as well as the central figures of the Frankfurt School—Horkheimer, Adorno, Neumann, Fromm, and Benjamin—Sethness Castro chronicles the radical philosopher's lifelong activism in favor of anti-capitalism, anti-fascism, and anti-authoritarianism together with Marcuse's defiant revindication of global libertarian-socialist revolution as the precondition for the realization of reason, freedom, and human happiness. Beyond examining Marcuse's revolutionary life and contributions, moreover, the author contemplates the philosopher's relevance to contemporary struggle, especially with regard to ecology, feminism, anarchism, and the general cause of worldwide social transformation.