Who is I. Lewis Libby? At the center of the CIA leak investigation, he is so mysterious that he hides his first name. The adviser universally known as "Scooter" represents the other side of the Bush administration: the secret undisclosed side. Like the vice president he works for, Libby prefers to work on policy in the shadows and leave the politics to others.

http://www.truthout.org/docs_2005/102205Y.shtml