Who Is It?

Who is it, and described by whom?  Strictly speaking, you might not recognize the actual speaker but you will know his father, and the son is thought to be a chip off the old block.  I doctored it to remove clues:

Tall, largely built, handsome, genial, with liberal ...openness toward all he liked he  had also [his peoples']  habit of command. … For a year, at least … was the most popular and prominent man in his class, but then seemed slowly to drop into the background. The habit of command was not enough, and [he] had little else.  He was simple beyond analysis; so simple that even the simple [outsider]  could not realize him. No one knew enough to know how ignorant he was; how childlike; how helpless before the relative complexity of a school. As an animal [people of his sort] seemed to have every advantage, but even as an animal he steadily lost ground.
 … Strictly,  [a man of this sort] has no mind;  he  had temperament.  He was not a scholar; he had no intellectual training; he could not analyze an idea, and he could not even conceive of admitting two.

Who? Go here.