Scott Westerfeld
This author gained popularity with a series that began with The Uglies which is set in a futuristic society. At the age of 16, teens would undergo an operation that made them very pretty. So why would a small gang called the Smokies rebel against something so very "nice"? Read to find out.
Also, if you like The Uglies series, start on a newer series by Scott Westerfeld starting with a book called Leviathan.