  X-ray surveys of the extragalactic universe are now able to detect
significant numbers of AGN out to high redshift (z~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 Lx > 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.
