Well Parkinsons can be controlled with medication so i’m sure he is fine.
I read his autobiography a while ago, its fantastic.

heeee stillllll cannnnnnn acttttt.

I saw a documentary on this years ago.
Off the top of my head (I’m not 100% sure) it makes him shake and gives him anxiety, which he can work into character sometimes.

I haven’t heard anything really recent though to know if he can act at the moment.

Actually he can act very well. He just needs to be on his meds a lot. He recently did a guest shot on Boston Legal and did very well.

He can still act, even though parkinson’s makes it more challenging. He was in the show Rescue Me for 4 shows and the character he played was in a wheelchair. It was a challenge because of his dyskinesias, which cause him to be moving almost constantly. He has to time a lot of what he does around his medication on times.