Xbox department head Robbie Bach and "Chief Experience Officer" (and father of the 360) J Allard will be ending employment with Microsoft this fall, according to an internal memo sent from company head Steve Ballmer and acquired by TechFlash. Allard will stay on in some form, serving as an "advisor" to Ballmer, though Bach will be outright leaving after nearly 22 years with Microsoft.
http://www.joystiq.com/2010/05/25/j-...xit-microsoft/

These are the guys behind the Xbox, Zune and Project Natal.