Quote from Ava in Pilot
[aside to camera:] Gregory: I'm subbing here because I need a job until I can become principal. It's what I studied for. I actually interviewed here and got it, but then... I don't know... something happened. [separately to camera:] Ava: I go to the same church as the Superintendent. Caught him cheating on his wife with the deaconess. I needed a job.