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Kenneth Hartley Blanchard is an American author, business consultant and motivational speaker who has written more than 70 books, most of which were co-authored. His most successful book, The One Minute Manager, has sold more than 15 million copies and been translated into many languages. He is the co-creator with Dr. Paul Hersey of Situational Leadership, a theory they developed while working on the textbook Management of Organizational Behavior.