English professor Don Foster's unique view of the world -- and literature -- came to light when he figured out that Joe Klein, who had been lying about his authorship, really was the writer of Primary Colors.  In Author Unknown, Foster lays out his personal history and interest in content analysis, along with his methodology.  The result is a good read that can show journalists how to use easily available tools to analyze text of any sort.  Highly recommended, and plenty of used copies via the online market.

"In Author Unknown, Don Foster reveals a startling fact: since no two people use language in precisely the same way, our identities are encoded in our own language, a kind of literary DNA. Combining traditional scholarship with modern technology, Foster has discovered how to unlock that code and, in the process, has invented an entire field of investigation -- literary forensics -- by which it becomes possible to catch anonymous authors as they betray their identities with their own words."
Source: http://www.fsbassociates.com/holt/authorunknown.htm#order