Everyone knows who Brangelina is -- the dynamic and altogether gorgeous Hollywood couple comprised of Angelina Jolie and Brad Pitt. But what's behind the couple ... and is there a proverbial Oz -- a man behind the curtain that is Brangelina? Ian Halperin examines this in his book 'Brangelina: The Untold Story of Brad Pitt and Angelina Jolie,' and PopEater is exclusively running an excerpt from the book that takes a look at the man credited with creating the supercouple's image and reputation. Read It After the Jump!