Both Aristotle and moral psychology have been flourishing areas of philosophical inquiry in recent years. This volume aims to bring the two streams of research together, offering a fresh infusion of Aristotelian insights into moral psychology and philosophy of action, and the application of developed philosophical sensibility as regards the reading of Aristotelian texts. The contributors offer stimulating new examinations of Aristotle's understanding of the various psychological states, dispositions, processes, and acts -- including reasoning and deliberation -- that contribute to the understanding of human action and its ethical appraisal.