If you're not sure of early intervention agency's in your area inquire at your childs school for guidance & direction.
I'm sure if you looked it up online you'd find a list of local agency's in your area.
A full evaluation is run there so ins info is needed. There they decide on his eligibility.

I think they are Parapros here maybe. Sounds like they are helpful to have.

Therapeutic Staff Support. Therapists that go to class with them to give cues and redirection when they're focus and cooperation is off. BS are Behavior Specialists that can be assigned to them as well

Ask ALOT of questions. Ask about a social story, Redirection and reinforcement methods how and when will they be used. What is the procedure if a meltdown occurs..ex...do they use a timeout room ECT ECT. Since we understand consistent methods works how will they be applied. Whenever I go the meetings for either of my son's I know what to ask, always what they don't see coming, catch them off guard to see the response and the answers to those questions. I have learnt what they say and what we know are like night and day, hope this helps.

Very much! When my daughter was younger she had one in class. Now she's in her third year of being in school completely independent. Plus was mainstreamed for certain classes.