Current day influencers are Steve Jobs and Oprah Winfrey.
Other top influencers include Elon Musk, Sheryl Sandberg and Jay Z -- each globally renowned in their own niches.
A similar impact can be had on a more localized level with highly satisfactory results.
It is bestowed by others -- people whose opinions, actions and lives have been positively changed because of your message or solutions.
It appears that the structure of the brain changes in response to changes in behavior, environment and neural processing.
Precisely-timed 18-minute Ted Talks may seem quite long when compared to the shorter and shorter radio and TV interviews currently done, sometimes as short as five minutes.