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Spencer Johnson is best known for his series of Valuable Children's Tales, and his 1998 motivational book Who Moved My Cheese?, which entered the New York Times bestseller list. Johnson is the president of Spencer Johnson Partners. Johnson also wrote Yes or No: The Guide to Better Decisions (1992). He co-authored the One Minute Manager book series with managing writer Ken Blanchard, although each writer has added their own book to the series. His latest book is Peaks and Valleys.