Robert Greene is the author of the New York Times bestsellers The 48 Laws of Power, The Art of Seduction, The 33 Strategies of War, and The 50th Law. His highly anticipated fifth book, Mastery, examines the lives of great historical figures such as Charles Darwin, Mozart, Paul Graham and Henry Ford and distills the traits and universal ingredients that made them masters. In addition to having a strong following within the business world and a deep following in Washington, DC, Greene's books are hailed by everyone from war historians to the biggest musicians in the industry (including Jay-Z and 50 Cent).

Greene attended U.C. Berkeley and the University of Wisconsin at Madison, where he received a degree in classical studies. He currently lives in Los Angeles.

Curtis James Jackson III (born July 6, 1975), better known by his stage name 50 Cent, is an American rapper. He rose to fame with the release of his albums Get Rich or Die Tryin (2003) and The Massacre (2005). Both albums achieved multi-platinum success, selling over twenty-one million copies combined. He is the author of From Pieces to Weight: Once Upon a Time in Southside Queens (S&S, 2006). He lives in New York.