Most modern readers of the Stoics think first of later authors such as Seneca, Epictetus and Marcus Aurelius. Existing works like Long and Sedley's The Hellenistic Philosophers concentrate on the Stoics of the early school. This book focusses on the more influential later school, including key figures like Panaetius and Posidonius, and provides well-chosen selections from the full range of Stoic thinkers. It emphasizes their important work in logic, physics and cosmology as well as in ethics. Fresh translations and incisive commentary present a picture of Stoic thought informed by up-to-date historical research and philosophical analysis. The book will be essential for scholars and students of ancient philosophy and of Hellenistic and Roman culture.