assuning you have PD, theh majority come up hhere to L.A. county. I go to UCLA's movement disorder clinic. Dr. Jeff Bronstein. Jeff is the BEST! He is always there for me.
Dr. Mark Lew at the clinic at USC is excellent also.
This is not to say there are no good docs in OC, there are. you can look at the NPF "Find a doc" at the National Parkinsons Foundation website.
The hard part about choosing is there are so many to choose from!!!!

Charlie