I wonder why Marc Parry chose to call him "Mr." instead of the correct "Dr."... a total of 12 whole times.
All Post-Docs insisted on being called "Dr." rather than "Mr."and all tenured Profs on being called "Prof." rather than "Dr."
Non-tenured Assistant Profs had the worst choice get called Dr. and upset themselves or get called "Prof." and potentially upset the people who could grant them tenure :) Guess which one they choose?
It's the same reasoning as why one wouldn't list a driving license as an accomplishment when one is a professional race car driver - 'of course' everybody who is somebody in racing has passed their driving exam a long time ago.
(the same comment was mentioned in the comments to the OP - I was quite surprised nobody mentioned my above reasoning, I thought it was common knowledge by now).
Chronicles of higher education might have a different publishing standard, but I'm not sure why they would.
This wikipedia entry seems to indicate that it is common to address someone of his stature as "Dr.", with the possible exception of perhaps in social settings where doing so might cause confusion (with MD).