I would think journalists' standards of a great mind in this instance pretty much match up with an average persons definition too. His career as a barrister/adv

I would think journalists' standards of a great mind in this instance pretty much match up with an average persons definition too. His career as a barrister/adviser/judge is achievement enough, and then in between he writes meticulously researched historical tomes and learns languages? The guy basically is Mycroft Holmes only more productive :)