What are the agents of life? Central to our conception of the biological world is the idea that it contains various kinds of individuals, including genes, organisms, and species. How we conceive of these agents of life is central to our understanding of the relationship between life and mind, the place of hierarchical thinking in the biological sciences, and pluralistic views of biological agency. Genes and the Agents of Life rethinks the place of the individual in the biological sciences, drawing parallels with the cognitive and social sciences. Genes, organisms, and species are all agents of life, but how are each of these conceptualized within genetics, developmental biology, evolutionary biology, and systematics? The book includes highly accessible discussions of genetic encoding, species and natural kinds, and pluralism above the levels of selection, drawing on work from across the biological sciences. A companion to Boundaries of the Mind, (Cambridge, 2004) where the focus is on the cognitive sciences, this volume will appeal to professionals and students in philosophy, biology, and the history of science. Robert A. Wilson is Professor of Philosophy at the University of Alberta. He is the author of Cartesian Psychology and Physical Minds (Cambridge, 1995).