The book "Emile" (or "Emile, or On Education") was written by Jean-Jacques Rousseau. It is one of the most important works on education and is considered a seminal treatise on the principles of education in the Enlightenment era.
Step 1: Rousseau’s Influence
In "Emile," Rousseau discusses the education of a young boy named Emile and presents a philosophy based on natural education, which emphasizes the importance of allowing children to develop in a natural and unstructured environment, free from societal pressures.
Step 2: Conclusion
Thus, the correct answer is J.J. Rousseau, as he is the author of "Emile."
Final Answer: J.J. Rousseau.