Being the son of Dr. Jock Murray, the well regarded MS neurologist from OTTAWA, CA, would most likely make the son a Canadian.
The Ottawa doctor is the only MS neurologist that comes up when you google the name and MS neurologist.
His father is Ronald S. Murray, of the Rocky Mountain MS Center. Here is a copy of what they posted on their website:
http://www.freerepublic.com/focus/f-news/1937068/posts?page=1624#1609