Senior vice president, AppleRank: 24Why he matters: It's an open secret that Fadell is the real engineering genius behind the iPod. In fact, he was already well on his way to building a hard-drive-based MP3 player that could store thousands of songs (sound familiar?) when Apple hardware chief Jon Rubinstein tapped him to lead the original iPod engineering team.
By 2006, when Fadell was given the reins of the entire iPod division, it was generating more revenue for Apple than the Mac. What's he done for us lately? Glad you asked. Have you heard of this new thing called the iPhone?
Meet 50 Who Matter winner Gina Bianchini. Her site, Ning, lets anyone be a social networking mogul. (more) 
