Co-founder and CEO, Square
Co-founder and executive chairman, Twitter
Is he the Steve Jobs of his generation? That's been the buzz surrounding Dorsey, who holds down two roles (a la Jobs' dual gigs at Apple and Pixar) at Twitter and mobile payments platform Square. Square has been on a roll: In August, Dorsey inked a deal with Starbucks to process all card payments in their 7,000 U.S. stores. Square Wallet, an app that allows customers to make payments with their phones, also debuted in the coffee retailer's stores earlier this month. Meanwhile, Twitter continues to show its relevance; the messaging service proved its merits during the presidential debates and Hurricane Sandy. --EF
He's a pro-customer, tightfisted risk-taker who is conditioning Wall Street to embrace his erratic earnings. If you're running a business with high margins - watch out.