Microsoft's gaming division saw a management shakeup Thursday.
Microsoft said that Jeff Bell, vice president of global marketing for the company's interactive entertainment business, has stepped down to "pursue other opportunities."
Shane Kim will take over a newly established role as Microsoft's vice president of strategy and business development. Phil Spencer, who has worked in Microsoft's Game Studios for the past six years, will direct all first-party development and publishing efforts worldwide.
Microsoft is looking for Bell's replacement. Bell, who will stay on through the summer, was among those behind the marketing campaigns for popular Xbox games Gears of War and Halo 3.
Since it was first launched, Microsoft has sold more than 19 million Xbox 360 consoles.