Debby Stone, after 16 years practicing law, is an executive coach and keynote speaker. The author of "The Art of Self-Promotion: Tell Your Story, Transform Your Career," she contends you have about 20 seconds to capture a listener’s attention and begin a conversation about the brand that is you. “In a Twitter, soundbite world, attention spans are short. Telling your story and doing it in a confident, authentic and graceful way is the key difference