to offset the company's reliance on PCs and mobile computing devices as the company entered the Post-PC era; in reporting quarterly results during April 2013, while Windows Phone 8 and Windows 8 had not managed to increase their market share above single digits, the company increased its profit 19% over the previous quarter in 2012, as the Microsoft Business Division (including Office 365) and Server and Tools division (cloud services) are each larger than the Windows division. Ballmer attracted criticism for failing to capitalize on several new consumer technologies, forcing Microsoft to play catch-up in the areas of tablet computing, smartphones and music players with mixed results. According to the Wall Street Journal, under Ballmer's watch, "In many cases, Microsoft latched onto technologies like smartphones, touchscreens, 'smart' cars and wristwatches that read sports scores aloud long before Apple or Google did. But it repeatedly killed promising projects if they threatened its cash cows [Windows and Office]." Ballmer was even named one of the worst CEOs of 2013 by the BBC. As a result of these many criticisms, in May 2012, hedge fund manager David Einhorn called on Ballmer to step down as CEO of Microsoft. "His continued presence is the biggest overhang on Microsoft's stock," Einhorn said in reference to Ballmer. In a May 2012 column in Forbes magazine, Adam Hartung described Ballmer as "the worst CEO of a large publicly traded American company", saying he had "steered Microsoft out of some of the fastest growing and most lucrative tech markets (mobile music, headsets and tablets)". In 2009, and for the first time since Bill Gates resigned from day-to-day management at Microsoft, Ballmer delivered the opening keynote at CES. As part of his plans to expand on hardware, on June 19, 2012, Ballmer revealed Microsoft's first ever computer device, a tablet called Microsoft Surface at an event held in Hollywood, Los Angeles. He followed this by announcing the company's purchase of Nokia's mobile phone division in September 2013, his last major acquisition for Microsoft as CEO. On August 23, 2013, Microsoft announced that Ballmer would retire within the next 12 months. A special committee that included Bill Gates would decide on the next CEO. There was a list of potential successors to Ballmer as Microsoft CEO, but all had departed the company: Jim Allchin, Brad Silverberg, Paul Maritz, Nathan Myhrvold, Greg Maffei, Pete Higgins, Jeff Raikes, J. Allard, Robbie Bach,