Elon Musk.

Wait. Hear me out. The power to summon someone, hold them for an hour and force them to be conscious is really significant. Sure, there's nothing I could say to have any immediate effect. I'd just mention that he should divest his wealth to the poor or else when my hour is up, someone else is going to summon him. It'll keep happening until he's no longer the wealthiest person. Then, keep going down the list.