About 50 supermassive black holes (SMBHs) have now been found at z > 6, including a 12 billion solar mass candidate at z = 6.3 and a 2 billion solar mass object at z = 7.1. The discovery of these high redshift quasars severely challenged current paradigms of early structure formation, but new simulations have now shown that they can be understood to be direct collapse black holes (DCBHs) at the nexus of heavy, cold accretion flows that drive their rapid growth.  We have developed radiation hydrodynamical models of SMBH birth and evolution in cosmological environments that now account for the masses of the z = 7.1 and 6.3 quasars whose H II regions can be post processed to produce their NIR and Ly-a luminosities and their footprint at 21 cm.  I will discuss these synthetic observables and the prospects for detection of 6 < z < 15 quasars by JWST, the E-ELT, Euclid and WFIRST.