The 4th School on X-Ray Spectroscopy Methods will be held at the LNLS, in Campinas, Brazil, between September 14th and 15th. The event will happen just before the LNLS Annual User’s Meeting (RAU), as a satellite event. This school will focus on the fundamentals of x-ray spectroscopy methods and data analysis and its applications. The first day will include introductory lectures about the theoretical and experimental aspects of hard x-ray spectroscopy, followed by one day of advanced lectures and tutorials on data analysis and examples of applications in different fields.