In the wake of the failure of the joint congressional committee that was tasked with coming up with a proposal to reduce federal deficits over a decade by $1.2 trillion, Michael Bloomberg, mayor of New York City, said at a news conference, “It’s the chief executive’s job to bring people together and to provide leadership. I don’t see that happening.” The mayor may have been wrong. Take the word executive: literally it is to execute, or implement, which implies management rather than leadership. Put another way, implementation depends on a goal already established, presumably by a leader. To lead is to formulate a vision of social reality that is an ideal, and thus consisting of goals rather than actualities, and then to persuade others to accept that social reality. Once the directionality is established, the means, or strategies, can be executed by managers (i.e., those who manage the implementation).
The full essay is at "Presidential Leadership."