Abstract: Luminous Active Galactic Nuclei (AGN: log Lx > 43 erg/s) are hypothesized to play a important role in galaxy evolution, yet how these objects are triggered and evolve is still poorly understood. A major advance has been the assembly of well-sampled (radio-to-Xray) spectral energy distributions (SEDs) of large, complete samples of X-ray-selected AGN. An analysis of these SEDs suggests a possible evolutionary scenario whereby luminous AGN begin their lives in a heavily dust-obscured phase before emerging as UV-excess Quasars. Observations with current facilities (e.g. Chandra, JWST, ALMA, VLA) are providing important constraints on AGN evolution; however, new facilities are required in the hard X-ray (10 – 50 keV) to provide accurate intrinsic X-ray luminosities for Compton-Thick sources, in the far-infrared (30 – 300 microns) to provide high-resolution (sub-aarcsond) constraints on source sizes, and in the radio (10 – 100 GHz) to provide sufficient sensitivity and resolution to detect compact jets and accurately identify the most obscured sources.
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