Hartmut Rosa is a leading social theorist and his books on social acceleration and resonance have become milestones in discussions about the problems and promises of late modern societies.  Rosa not only presents a critical diagnosis of our times but also searches for innovative solutions.  This new collection of Rosa’s essays provides an overview of his work and explores key topics and concepts in depth.  Among the topics discussed are Charles Taylor’s account of alienation, self-interpretation and social critique; the theory of acceleration and the challenges for identity formation and democratic politics in the high-speed society; the theory of resonance and its relation to alienation and uncontrollability; and the relation between social theory and moral philosophy.  Among other things, this volume highlights the influence of Charles Taylor’s social philosophy on Rosa’s work and it brings out the architecture of Rosa’s social theory, in particular the opposition between the concepts of resonance and alienation.  In a substantial introduction, Frédéric Vandenberghe provides a comprehensive overview of Rosa’s work. This volume, by one of the most creative and influential social theorists writing today, will be essential reading for anyone interested in contemporary social theory, critical theory and the sociology of late modernity.