What should be the main focus of a leader?

All leaders are faced with a tough decision, one that will ultimately guide the direction of their group or company: What should the focus of the company/group be? Furthermore, is it always centered around the best interests of solely the leader?

Here is an article from Fox Business, "Dr. Kent Ingle: THIS is the toughest leadership lesson any manager can learn," which discusses what a leader should focus on in terms of both the leader's need and those of the whole company.