Super-massive black holes (SMBHs; >1e6 Msun) are now believed to reside at the centers of nearly all massive galaxies. As such, the cosmological evolution of AGNs and the growth of the SMBHs that power them are extremely important constraints on models of galaxy formation and evolution. Obtaining a true census of these AGN, however, has proven difficult due to various observational biases. Invariably, one must look to several different tracers such as >2keV X-ray continuum, mid-IR continuum, radio continuum/morphology, and high-ionization emission lines to understand the true AGN population. I have worked on large number of SMBH-related topics over the past ~20 years, from in-depth studies of nearby AGN to surveys of many 100s to 1000s of distant AGN, using some of the deepest Chandra, HST, Spitzer, and ground-based observations ever performed.