help! bringing note-taker to mtg with prof? (severe arthritis) (ADA)

I have severe (psoriatic) arthritis and am on meds (sulfasalazine,
indicin, etc.).

I am in grad school at a local university. I have an upcoming meeting
with the dept. chair on a controversial policy issue.  I want to bring
a person who will take notes for me.  What are my rights (ADA,
whatever)? Thanks...