Spencer Johnson was an American author and motivational speaker, best known for his influential books on personal development and management. His most famous work, Who Moved My Cheese?, published in 1998, uses a simple parable to illustrate how people can adapt to change in their work and personal lives. Johnson's writing often focuses on themes of change, leadership, and success, making complex ideas accessible to a wide audience. He co-authored several books with Kenneth Blanchard, including The One Minute Manager, which emphasizes effective management techniques in a concise format.