V době, kdy Chrýsippos vstoupily do STOA Poikile akademie, Cleanthes na Asson se stal druhou hlavou po smrti Zeno. Chrýsippos studoval pod Cleanthes, ale byl také ovlivněn učení Plato.
By the time Chrysippus joined the Stoa Poikile Academy, Cleanthes of Assos had become the second head following the death of Zeno. Chrysippus studied under Cleanthes, but he had also been influenced by the teachings of Plato .