Joachim Kempin, a former Microsoft employee from 1983-2002, recently wrote a book called "Resolve and Fortitude: Microsoft's 'Secret Power Broker' Breaks his Silence" that will be published today.

The book details Ballmer's role as CEO, and how he has kept that position for so long. According to Kempin, Ballmer pushes any rising star within Microsoft out before they have the chance to potentially replace him.