The title is a spin; it sucked me into buying the book, as did the promotions from Public Radio International/National Public Radio.
Who doesn't want to hear the strike of creativity against substance, see the place where many ideas finally ignite a single creative work. That's what "Spark: How Creativity Works" would have been about...if it weren't about the author instead.
Have you ever seen a photograph with the photographer's index finger accidentally in the shot? That's how Spark is. You lose the enchantment of what might have been a lovely shot because all you can see is the author popping in, page after page. There's little space for anything else.
Julie Burstein rightly qualified herself as an expert at the outset, a necessary step. She and her intimate perspective belonged in the intro to the 9/11 piece as she was THERE, a witness. However, Ms. Burstein then continues to insert herself into every intro and into some of the stories as well. She has pride in her work, yeah, but keep it out of my way, as the reader.
The cross section of interviewees was fantastic. Few of the anecdotes inspire. As another reviewer here mentioned, I'd be willing to wager the interviews were more inspirational on the radio than in print.
Visit your local public library. Wait for the paperback, or wait for it to appear at the second-hand bookstore. You might even find it there soon, if you live near me.