  We briefly review the synergy between X-ray and infrared observations for
Active Galactic Nuclei (AGNs) detected in cosmic X-ray surveys, primarily with
XMM-Newton, Chandra, and NuSTAR. We focus on two complementary aspects of this
X-ray-infrared synergy (1) the identification of the most heavily obscured AGNs
and (2) the connection between star formation and AGN activity. We also briefly
discuss future prospects for X-ray-infrared studies over the next decade.

High Energy Astrophysical Phenomena;Cosmology and Nongalactic Astrophysics;Astrophysics of Galaxies