Casper Bruun Jensen is one of the most intellectually accomplished and creative theorists of second-generation Science and Technology Studies (STS) as well as one of the most active and productive researchers in the field. In Ontologies for Developing Things, he offers a series of highly original delineations and vigorous defenses of recent developments--or, as he calls them “dispositions”--in STS (ontological, performative, pragmatist, and so forth) through a series of parallel narrations of his own onsite studies of the introduction of new medical-information technologies in Denmark and Canada. Ontologies for Developing Things is a work of unflagging intelligence and intellectual energy, spilling over with new ideas, surprising angles, sharp perceptions and interesting juxtapositions, and written with correspondingly attractive punch and force. Readers interested in information technologies, contemporary developments in social studies of science, and related cultural and political theory will find the book immensely engaging and endlessly useful. - Barbara Herrnstein Smith, Duke University and Brown University [author of Scandalous Knowledge: Science Truth and the Human and/or Natural Reflections: Human Cognition at the Nexus of Science and Religion]