With Zoom!, Fortune magazine extends one of its most successful franchises, 40 Under 40, to bring you the best kept secrets from top entrepreneurs, business leaders and rising tech stars. Discover how Mark Zuckerburg and Jack Dorsey revitalized social media, how Karl-Johan Persson turned a troubled retailer into a billion dollar fashion chain and why Ryan Seacrest is redefining the term "media mogul." Zoomers features the fascinating profiles of these and other young innovators and provides readers with tips to fast track their own career success.