Gregory Callahan was a shrewd individual by nature.

He was also selective in how he conducted himself, both in public and in private. Whenever he was with others, he exuded the aura of a calm, mature man with a flair for business. He was sensible and firm, knowing when to punish and when to reward.

He understood that he couldn’t buy loyalty and that he had to earn it through his own tactics. He also found at an early age that he had a talent for persuasion and for becoming intimidating enough to get what he wanted.

It was all a matter of skill and confidence. Without those, he didn’t...