CEO, eBay
In the four years since he replaced Meg Whitman as CEO, eBay (EBAY, Fortune 500) has resurged in a way few other Web 1.0 properties can claim. Its core Marketplaces business raked in $1.8 billion in revenue last quarter, its best performance in years. Meanwhile, its PayPal payments platform is growing so fast that Donahoe expects it to surpass Marketplaces in revenue within the next three to five years. --JM
NEXT: 5. Oh-Hyun Kwon