Brosseau outlines steps to take you from a smart, creative person with an interesting take on the world (or, more realistically, some small part of it) to a "thoughtleader"--someone recognized by the public (or, again, the relevant part of it) as a leader worth listening to.
The steps are hardly revolutionary, but having them set out in a clear, step-by-step guide is really quite helpful and gives you a great framework to think about the steps you should take. Obviously, you need to have something to say of interest...but Brousseau is very good at assuring the reader that many more people meet this criteria than think they do. After you figure out what you have to say, you need to figure out the best way to say it, who to say it to, and how to ensure that your views are heard. Brousseau's suggestions go far beyond the obvious (e.g., tweet more), and include identifying others who share the space you want to be in, studying what they are saying, getting to know them, and getting their help--maybe even writing a paper together. She has tips on when to accept speaking engagements...and how to get invitations if you don't have any, and when to turn them down, if you have too many.
The book is clearly aimed at people working in the for-profit sector (as the author does), but she is clear that her ideas are well suited to the not-for-profit sector as well (and regularly inserts asides on how they apply to not-for-profits).
Highly readable and highly recommended, if this is something you have thought about.