'Simpson has written a superb introduction to Aristotle's hylomorphic philosophy of nature and the metaphysics of modern science, including biology. He skilfully locates Aristotle's innovations and insights within the main currents of both ancient and modern thought, explaining how they can break logjams in understanding the relationships between the micro- and macroscopic; between living things and their matter.' Robert Koons, University of Texas, Austin 'An essential guide for students and researchers who are interested in the increasingly complex debate on hylomorphism: comprehensive, fair-minded, and clearly written. A must-have for your bookshelves!' Anna Marmodoro, Durham University