  The Great Observatories Origins Deep Survey (GOODS) combines deep HST and
Spitzer imaging with the deepest Chandra/XMM observations to probe obscured AGN
at higher redshifts than previous multiwavelength surveys. We present a
self-consistent implementation of the AGN unification paradigm, which
postulates obscured AGN wherever there are unobscured AGN, to successfully
explain the infrared, optical, and X-ray number counts of X-ray sources
detected in the GOODS fields. Assuming either a constant ratio of obscured to
unobscured AGN of 3:1 (the local value), or a ratio that decreases with
luminosity, and including Compton-thick sources, we can explain the spectral
shape and normalization of the extragalactic X-ray "background" as a
superposition of unresolved AGN, predominantly at z~0.5-1.5 and L_x~10^43-10^44
ergs/s. The possible dependence of the obscured to unobscured ratio with
redshift is not well constrained; present data allow it to decrease or increase
substantially beyond z~1.
