WE PROPOSE TO COMPLETE THE CENSUS OF COSMIC BLACK HOLE GROWTH BY MEASURING LUMINOUS AND/OR DISTANT QUASARS USING SPITZER HERSCHEL CHANDRA AND XMM-NEWTON IMAGING IN STRIPE 82 THE DEEPEST SLOAN DIGITAL SKY SURVEY FIELD AND NOW THE PREMIER LEGACY FIELD AMONG ~100 DEG2 SURVEY AREAS. THESE EXTENSIVE ANCILLARY DATA OFFER UNSURPASSED SENSITIVITY TO ACCRETING SUPERMASSIVE BLACK HOLES IN LUMINOUS QUASARS OUT TO Z~6 INCLUDING OBSCURED OBJECTS MISSED BY OPTICAL/UV SURVEYS. WE ADDRESS SIX SCIENCE GOALS CENTERED ON THE GROWTH OF SUPERMASSIVE BLACK HOLES: 1) WE WILL CONSTRAIN THE MASS ACCRETED IN LUMINOUS QUASARS BY DETERMINING THE EVOLVING LUMINOSITY FUNCTION OF HIGH-LUMINOSITY X-RAYSELECTED AGN INCLUDING OBSCURED QUASARS ESPECIALLY AT HIGH REDSHIFT WHERE PREVIOUS SURVEYS HAVE LIMITED STATISTICS. 2) WE WILL BUILD A COMPREHENSIVE MULTI-WAVELENGTH POPULATION SYNTHESIS MODEL THAT DESCRIBES COSMIC BLACK HOLE ACCRETION ACROSS MOST OF THE HISTORY OF THE UNIVERSE CONSTRAINED BY THE WEALTH OF DATA NOW AVAILABLE. THIS WILL BE THE FIRST POPULATION SYNTHESIS MODEL THAT IS CONSTRAINED AT HIGH LUMINOSITY AND HIGH REDSHIFT (COURTESY OF STRIPE 82X). 3) WE WILL CHARACTERIZE THE SPECTRAL ENERGY DISTRIBUTIONS (SEDS) OF LUMINOUS X-RAY-SELECTED QUASARS INCLUDING OBSCURED ONES. WE WILL ASSESS THE DUST CONTENT IN THE HOST GALAXIES AND DIAGNOSE THE RELATIVE CONTRIBUTIONS OF BLACK HOLE FUELING AND STAR FORMATION USING HERSCHEL DATA TO PROBE THE COLD MOLECULAR GAS FROM WHICH STARS FORM AND COMPARING X-RAYS FROM ACCRETION ONTO THE CENTRAL BLACK HOLE. WE WILL ALSO USE HIGH-QUALITY OPTICAL IMAGING TO DISENTANGLE NUCLEAR FROM HOST GALAXY EMISSION IN A REPRESENTATIVE SUB-SAMPLE OF QUASARS. 4) USING SPITZER HERSCHEL CHANDRA XMM-NEWTON AND OPTICAL DATA WE WILL IDENTIFY CANDIDATES FOR THE MOST HEAVILY OBSCURED BLACK HOLES WHICH WE WILL FOLLOW UP WITH GROUND-BASED IR SPECTROSCOPY USING KECK AND PALOMAR (TO WHICH YALE HAS GUARANTEED ACCESS). IN THIS WAY WE WILL RECOVER OBSCURED AGN MISSED BY OPTICAL SURVEYS MITIGATING OPTICAL BIASES IN QUASAR DEMOGRAPHY. 5) WE WILL INVESTIGATE THE LARGE-SCALE ENVIRONMENTS OF QUASARS IN WHICH BLACK HOLES APPEAR TO ACQUIRE AT LEAST HALF OF THEIR MASS BY STUDYING THE CLUSTERING OF AGN IN STRIPE 82. SPECIFICALLY WE WILL MEASURE THE HALO OCCUPATION DISTRIBUTION WHICH IS THE PROBABILITY OF A DARK MATTER HALO OF A GIVEN MASS TO HOST CENTRAL AND SATELLITE AGN ABOVE A GIVEN LUMINOSITY. WE WILL ASSESS WHETHER RAPID BLACK HOLE GROWTH DEPENDS ON HALO MASS AND HOW THE AVERAGE HALO MASS IN WHICH AGN OCCUR MIGHT DEPEND ON AGN OR GALAXY PROPERTIES. FOR THIS ANALYSIS THE HUNDREDS OF LUMINOUS QUASARS AT Z>2 IN STRIPE 82X AND ITS HIGH REDSHIFT COMPLETENESS (92%) ARE PARTICULARLY IMPORTANT. 6) WE WILL INVESTIGATE EARLY BLACK HOLE GROWTH AT Z>6 BY ANALYZING FLUCTUATIONS IN THE INFRARED AND X-RAY BACKGROUNDS (I.E. BELOW SOURCE DETECTION LEVELS). SPECIFICALLY WE WILL DIRECTLY CORRELATE THE SPITZER-MEASURED COSMIC INFRARED BACKGROUND (CIB) AND THE COSMIC X-RAY BACKGROUND (CXB) MEASURED WITH XMM-NEWTON ON ROUGHLY 20 TIMES LARGER SCALES THAN PREVIOUS STUDIES. THIS OFFERS THE BEST PROBE OF EARLY BH GROWTH UNTIL HIGH-SENSITIVITY X-RAY OBSERVATORIES LIKE ATHENA AND LYNX. THESE STUDIES WILL DETERMINE HOW MUCH MASS IS ACCRETED IN THE MOST LUMINOUS AND/OR OBSCURED QUASARS AND HOW THE ENERGY RELEASED INTO GALAXIES DEPENDS ON KEY VARIABLES SUCH AS REDSHIFT AGN LUMINOSITY EDDINGTON RATIO AND WAVELENGTH. THIS ACCURATE DATAVALIDATED ESTIMATE OF THE RADIATION DEPOSITED INTO HOST GALAXIES IS ESSENTIAL FOR INCORPORATING FEEDBACK INTO MODELS OF GALAXY EVOLUTION. THE STRIPE 82X SURVEY AS THE RICHEST MULTIWAVELENGTH SURVEY COVERING>30 DEG2 OF THE SKY DEEP ENOUGH IN X-RAYS TO SEE LUMINOUS QUASARS OUT TO Z~10 WILL YIELD MANY IMPORTANT DISCOVERIES IDEALLY INCLUDING UNEXPECTED ONES FOUND BY OTHERS IN THE COMMUNITY.