Christopher Gill is a British philosopher and historian of ancient philosophy, best known for his work on Stoicism and ancient moral psychology. His research focuses on ancient conceptions of the self, rationality, and ethical agency, drawing on Stoic, Platonic, and Aristotelian sources. In influential works such as Personality in Greek Epic, Tragedy, and Philosophy and The Structured Self in Hellenistic and Roman Thought, Gill argues that ancient philosophy presents a relational and rational account of the self, distinct from modern notions centered on subjective inner experience. His scholarship clarifies Stoicism as an ethics of rational coherence and moral responsibility, grounded in a structured understanding of the human mind.