Unstoppable is performance-enhancing manual for those who are ready to change the world. Regardless of talent or skill set, there are four types of people in every organization: Undertakers, Caretakers, Play Makers, and Game Changers-but value is definitely not equal across the board. Game changers move things forward with relentless energy, effort, attitude, and excellence. They elevate those around them, inspire exceptional performance, and drive their organization to the top.