After graduating from law school he worked for a law firm based in Boston but was later laid off due to the recession of the 1990s.[7] From 2003 to 2006 he served as Senior Vice President for Business Development at Verisign.[8]
In 2006, he co-founded and ran mobile ads company Quattro Wireless. In late 2009, he sold Quattro Wireless to Apple for $275 million, joining Apple at the same time and reporting directly to Steve Jobs, leaving late in 2011. From 2011 to 2014 he was a partner with Highland Capital Partners.[8] He then became president and chief operating officer at Leap Motion until April 7, 2014.[9] After leaving Leap Motion he created a start-up called Remix Media Inc.[10] In November 2015 Miller co-founded a professional video gamingesports team called NRG Esports with Sacramento Kings co-owner Mark Mastrov.[11]NRG owns and operates the San Francisco Shock, one of the 20 franchised teams in Activision Blizzard's Overwatch League. In November 2017, Miller continued his involvement with esports and became an investor for a mobile esports company called Skillz as part of the company's Series C funding round.[12]