X-ray surveys of the extragalactic universe are now able to detect significant numbers of AGN out to high redshift ( z \sim 5 ) .
We highlight some results from the Chandra Multiwavelength Project ( ChaMP ) to measure the X-ray luminosity function out to these early epochs .
At z > 3 , we show that the comoving space density of luminous ( log~ { } L _ { X } > 44.5 ) AGN has a behavior similar to the optical QSO luminosity function .
With a newly compiled sample of AGN from ChaMP supplemented with those from additional surveys including the Chandra Deep fields , we present a preliminary measure of the luminosity function in the hard ( 2-8 keV ) band .
With 37 AGN at z > 3 , we continue to see a decline in the space density at high redshift over a wider range in luminosity .
We discuss the need to identify a larger sample of obscured AGN at high redshift to determine if an early epoch of hidden supermassive black hole growth occurred .