I like the show called CBS Sunday Morning and there is a reporter named Bill Geist on it who every time I saw him he appeared to be tremoring a little bit. I looked him up and as suspected he does have Parkinsons now for over 10 yrs. Here is a link to a great interview back in July of 2012 that he did announcing his situation.
http://www.cbsnews.com/8301-505269_162-57465578/bill-geist-parkinsons-revelation-very-difficult/