This volume features fifteen new papers by an international group of scholars in ancient philosophy, with a particular focus on new work in ancient Greek and Roman ethics, epistemology, logic, and science. The papers are organized around five broad topics: Plato, Aristotle's ethics and practical reasoning, Aristotelian logic, Hellenistic ethics, and Hellenistic epistemology. Specific topics covered include the refutation of the hedonist in Plato's Philebus, the question of whether modern interpreters are right to read Plato's Timaeus as "proto-historical," Aristotle's argument concerning virtue, Aristotle's discussion of practical reasoning in the realm of ethics, Aristotle's logical theory, classification and division of goods in ancient ethical theories, and belief, appearances, and assent in Hellenistic epistemology.