an effective leader must have "non-verbal communication" skills?

If I say an effective leader must have "non-verbal communication" skills, do you agree with me? Why? Is the below notes convincing?

There is an old saying that “it’s not what you say, but how you say it.” Perhaps nowhere does this hold more true than when applied to leadership, especially in the corporate environment. Clearly, non verbal communication is one of the most, if not the most critical type of communication. In fact, some of the most success modern business persons today have worked with speech coaches to not only improve their verbal communication but also the manner and mechanisms they use to deliver verbal content, in other words their non verbal communication.
Facial Expression: The overall facial expression is important to a receiver’s perception of credibility.
Posture: Upon investigation they found that Bill’s posture was lacking, he tended to shrink away from the spotlight, literally, at times, giving off the appearance of a lack of competence.

Thanks.

Absolutely. It is the "true smile" which involves the eyes and mouth, vs. "false" which involves only the mouth. Clothing is very important,…red tie means "business"….blue "calm"…etc. etc. Leaders are coached on these skills…..(psychologist, who has coached gov.leaders) (don't forget background setting in which communication takes place…library behind, war ships, computer labs, etc…that sends non-verbal message also)

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