This issue of SRN focuses on photoelectron spectroscopy, a technique that is flourishing at many synchrotron facilities worldwide. In a nutshell, it is a simple technique making use of the photoelectric effect and benefiting from the bright light available at synchrotrons. In the past two decades, one of its branches, angle-resolved photoemission (ARPES), has gained tremendous popularity due to its ability to provide insights into the physics of strongly correlated materials such as, for example, the high Tc superconductors. Its success rests on advances in instrumentation which, over the course of many years, have led to dramatic improvements in resolution in both energy and momentum.