Jeff Bezos is the visionary behind the world's largest online retailer, which serves more than 209 million active customers with products ranging from e-books to flat-screen TVs to dog food. The retailer has grown in part by snatching up its most sophisticated competition--shoe seller Zappos and Quidsi, parent of such sites as Diapers.com, Soap.com, Wag.com, and BeautyBar.com. It purchased robot maker Kiva Systems to accelerate the speed at which Amazon can assemble customer orders. Between 2008 and 2013, annual sales quadrupled to $61 billion. Along the way, Bezos built Amazon into the world's most trusted company, according to a Harris Poll, usurping a spot formerly held by Apple. Amazon also provides efficient, reliable back-end services to an enormous range of customers through Amazon Web Services. In 2013, Bezos bought The Washington Post.