Chrysippus (born c. 280 bc—died c. 206) was a Greek philosopher from Soli (Soloi) who was the principal systematizer of Stoic philosophy. He is considered to have been, with Zeno, cofounder of the academy at Athens Stoa (Greek: “Porch”). Credited with about 750 writings, he was among the first to organize propositional logic as an intellectual discipline.