Case in point? From what I've read he's reserved, keeps a very low profile, and is dedicated to his work. We know next to nothing about his personal life.
He reportedly had to essentially be dragged into a new home, as he was still staying in a small apartment nearby the HQ even after Jobs passed away. Dude just didn't give a shit about anything but Apple.
How so? Genuinely curious, I've got no idea what he's like as a person.