You hire people who work in the field and have experience. That's the problem with these positions: you basically have to hire the fox to watch the chicken coup, because the fox is the only one who knows what its weaknesses are.
Actually hiring the fox will just make things worst. You're feeding and protecting the fox that will kill your chickens at night, and he'll invite all his fox buddies for the kill.
Ok, how about, you hire a physics professor to do a physics problem, an electrician to fix an electrical problem, and a corporate business guy to fix a corporate business problem? There's just no one else to hire who will understand any of the stuff they're dealing with.