Jude Scanlon is the Brigadier of the Cadets, and has an office at the school. One of the childhood friends of Hannah, he also had a relationship with her which was destroyed by the unwillingness by either himself or Hannah to accept that they were the only two surviving members of their friends. Jude stops the fourteen year-old Taylor from going to Sydney, and later reveals much about circumstances to her when she is seventeen. He becomes a guardian to Taylor and Jessa ultimately.
I asked the same question. But i do know that he is the Brigadeer. I'm sorry, that's really all I know.