Which languages did Philo Judaeus use in his writings?

Philo Judaeus, a prominent Jewish philosopher from Alexandria, wrote his works in Greek.12

Living in a community that had been almost exclusively Greek-speaking for nearly three centuries, Philo was a product of a Hellenistic education that emphasized the liberal arts, rhetoric, and philosophy. He utilized this Greek cultural and linguistic framework to interpret the Hebrew Bible—specifically the Septuagint—and to synthesize Jewish religious doctrines with Platonic and Stoic philosophical concepts.213