seo specialist

Talking about seo, at the first time I read Google seo punish people with PageRank 0, I think the senior executive officer of Google company do this cruel action. Then I wondering what they do...? Are they nothing to do...? because as a senior executive of one big company like Google, I think they must be very busy to manage the company. But after all I know what they mean with seo specialist or seo expert and seo company is a search engine officer specialist, expert or company. That's make me a little funny with the meaning of seo here...ha...ha...ha...