I'd say, based on selfless action, the Ebola caregivers hands down. Though such a generic grouping doesn't really have the same meaning as an actual identifiable individual.
He is guiding a wildly successful Apple and when Steve passed that wasn't at all given.
Putin doesn't deserve it: he blinked when he was poised to invade Ukraine, totally whiffed grabbing the whole enchilada. Wimp's doing the proxy, "volunteers" thing shouldn't get the cover.