I am so thankful to everyone who attended this colloquium in the physics department at Colorado School of Mines. Our discussion began back in the 1880s with Hertz’s 1st observation and covered many practical aspects of photoelectron spectroscopy. In case anyone wants to look over the presentation, it’s here for you. Please cite it appropriately if you use any parts of it (as you see that I’ve done!). xps-colloquium-2016-web