Cicso  Leading Not Talking
At Cisco there is real understanding that the more senior you are the more important good management communication skills are for leadership.

We have coached a number of the most senior executives in this company. Coaching courses have lasted from 5 meetings to ongoing consultancy.
We have worked on:

internal communication
public speaking
media appearances

In each case we have tried to find the executive's most authentic voice and worked on that so that they can be more compelling for all their audiences in every aspect of their business.