GBS expert in Bay Area?

My 8yo son has had GBS for 2 years.  He’s made some improvement but still has a ways to go for recovery.  He’s been seeing the same neurologist the whole time and while I don’t have reason to believe the doctor isn’t providing proper care I also thought that maybe I should visit with a second doctor to just have a second set of eyes on my son and in case the other doctor had any new ideas or advice.  Does anyone know of a doctor in the San Francisco Bay Area they are fond of with experience in pediatric GBS?  Many thanks and best wishes to you all.

Dan