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While deep X-ray surveys provide the most efficient means of selecting AGN, they are substantially incomplete for the heavily obscured AGN predicted to dominate the active galaxy population both locally and in the distant universe. Fortunately, however, the high-energy emission absorbed by the dust and gas surrounding an AGN's central engine is re-emitted in the IR. Many methods have therefore been developed to use Spitzer to supplement the X-ray results. I will discuss my contributions to this field (e.g., the selection of radio-excess and power-law AGN), and will then critically review the full IR-selected AGN population. Finally, I will discuss new opportunities to track down the remainder of this missing population of AGN. |