Dr Ellen Clark is a lecturer in philosophy at the University of Leeds. Her work explores the metaphysics and epistemology of biological science, especially the ontology of the living world. She also researches levels of selection in evolutionary theory, the problem of defining the organism in biology and cultural selection theory. She was previously a postdoctoral fellow at All Souls College, Oxford. She is currently working on a Leverhulme Funded project to complete a monograph titled 'The Units of Life: Kind of individuals in biology.'