• Very nice and relatively brief review article from “Quasars and Cosmology” conference by Belinda Wilkes (CfA), a world expert on the subject: • Must account for physical processes producing prodigious luminosity from radio wavelengths through the X-ray and even gamma ray regimes. • Particular features of interest include radio-jets and the radio-quiet vs. radio-loud dichotomy, the “big blue bump” that produces the optical/UV energy peak and is thought to arise from an accretion disk, and the far infrared that represents re-radiation by hot dust.