GM, The behavior specialist at our school did the FBA. I have heard of school psychologists doing it also.

Talking to the psychologist helped DS like you wouldn't believe!!! DS has been to her for 3 or 4 separate issues and it only takes between 1 and 3 sessions before he doesn't need to go anymore! We are really lucky because she is a gifted advocate and has loads of experience with ASDs. Nan