In my observational studies, I focus on the energetic, brilliant objects known as blazars. These objects are part of a larger class called Active Galactic Nuclei, or “AGN,” consisting of actively accreting super-massive black holes in the cores of very old and distant galalxies. Blazars emit every kind of light observable, from radio waves through gamma rays. The amount of light emitted from blazars changes over time in a non-periodic fashion on timescales ranging from minutes to decades. This variability makes blazars interesting objects to observe over the course of a single night, several days, or even months or years. The observed characteristics of the variability in different kinds of light allow astronomers to test physical and computational models predicting blazar behavior.