CJ I agree with your proposition. However, Bill would be the first one to tell you that there are others with as much or more "knowledge" as him.

I will tell you that there is no one who can match Bill's combination of caring , interested and supportive approach to PB coupled with the application of his considerable knowledge both theoretical and practical to our problems.

It's the person behind the knowledge that makes Bill truly a gem. Just like with doctors its the commitment to the patients and not just that one was first in his med school class that makes a true physician. In that sense Bill is the PB physician .