Philo of Alexandria
Philo Judaeus of Alexandria (30 BC - 45 AD) was a Jewish philosopher who lived in the city of Alexandria, in northern Egypt. He acted as a mediator between Hellenistic philosophy and Christianity and Neoplatonism.
Philo influenced both Plotinus and St. Augustine. He had a dualistic view of the world, which he separated into the world of matter and the world of God, since if matter had been created by God, the existence of evil would be inexplicable. Philo established a connection between these worlds through intermediary beings, which represent different aspects of God's existence and thought.
Philo indeed never mentions Jesus in his writings.
There is a short biography of Philo on the Philo page of Torrey Seland.