Answer the following Q with stream of consciousness. Context: The explosion of the print culture, which started in the 15th century with Johannes Gutenberg's printing press, was both a result of and a cause of the increase in literacy. The number of books published in the period of the Enlightenment increased dramatically due to the increase in demand for books, which resulted from the increased literacy rates and the declining cost and easier availability of books made possible by the printing press. There was a shift in the percentages of books printed in various categories during the 17th century.

Question: who developed a method of printing that greatly stimulated the growth of literacy?
The relevant sentence in the passage is: The explosion of the print culture, which started in the 15th century with Johannes Gutenberg's printing press, was both a result of and a cause of the increase in literacy. Therefore, the final answer is Johannes Gutenberg.