In this major new study, Tyler Huismann connects Aristotle's natural philosophy to modern theories of causation and provides fresh interpretations of classic issues. He links two of the most important notions in Aristotle's philosophy, accidents and causes, and using the concept of accidental causation as a guide, argues for ground-breaking proposals on some of the most foundational areas of Aristotle's thought: the relation between substances and accidents, the nature of efficient causation, the workings of 'qua,' the possibility of uncaused events, and the role of accidental causation in the natural world. Structured around close readings of Aristotle's Physics and Metaphysics and informed by contemporary theories of causation, Huismann's book offers students an accessible treatment of some of Aristotle's core texts, and provides specialists with a series of provocative interpretations.