X-RAY OBSERVATIONS OF ACTIVE GALACTIC NUCLEI (AGN) CONTAIN A WEALTH OF INFORMATION RELEVANT FOR UNDERSTANDING THE STRUCTURE OF AGN THE PROCESS OF ACCRETION AND THE GRAVITATIONAL PHYSICS OF SUPERMASSIVE BLACK HOLES. A PARTICULARLY EXCITING DEVELOPMENT OVER THE PAST FOUR YEARS HAS BEEN THE DISCOVERY AND SUBSEQUENT CHARACTERIZATION OF TIME DELAYS BETWEEN VARIABILITY OF THE X-RAY POWER-LAW CONTINUUM AND THE INNER DISK REFLECTION SPECTRUM INCLUDING THE BROAD IRON LINE. THE FACT THAT THE BROAD IRON LINE SHOWS THIS ECHO OR REVERBERATION IN XMM-NEWTON SUZAKU AND NUSTAR DATA IS A STRONG CONFIRMATION OF THE DISK REFLECTION PARADIGM AND HAS ALREADY BEEN USED TO PLACE CONSTRAINTS ON THE EXTENT AND GEOMETRY OF THE X-RAY CORONA.HOWEVER CURRENT STUDIES OF AGN X-RAY VARIABILITY INCLUDING BROAD IRON LINE REVERBERATION ARE ONLY SCRATCHING THE SURFACE OF THE AVAILABLE DATA. AT THE PRESENT TIME ESSENTIALLY ALL STUDIES CONDUCT TEMPORAL ANALYZES IN A MANNER THAT IS LARGELY DIVORCED FROM DETAILED SPECTROSCOPY - CONSISTENCY BETWEEN TIMING RESULTS (E.G. CONCLUSIONS REGARDING THE LOCATION OF THE PRIMARY X-RAY SOURCE) AND DETAILED SPECTRAL FITS IS EXAMINED AFTER THE FACT.WE PROPOSE TO DEVELOP AND APPLY NEW ANALYSIS TOOLS FOR CONDUCTING A TRULY UNIFIED SPECTRAL-TIMING ANALYSIS OF THE X-RAY PROPERTIES OF AGN. OPERATIONALLY THIS CAN BE THOUGHT OF AS SPECTRAL FITTING EXCEPT WITH ADDITIONAL PARAMETERS THAT ARE ACCESSING THE TEMPORAL PROPERTIES OF THE DATASET. OUR FIRST SET OF TOOLS WILL BE BASED ON FOURIER TECHNIQUES (VIA THE CONSTRUCTION AND FITTING OF THE ENERGY- AND FREQUENCY-DEPENDENT CROSS-SPECTRUM) AND MOST READILY APPLICABLE TO LONG OBSERVATIONS OF AGN WITH XMM-NEWTON. LATER WE SHALL DEVELOP MORE GENERAL SCHEMES (OF A MORE BAYESIAN NATURE) THAT CAN OPERATE ON IRREGULARLY SAMPLED DATA OR QUASI-SIMULTANEOUS DATA FROM MULTIPLE INSTRUMENTS. THESE SHALL BE APPLIED TO THE LONG JOINT XMM-NEWTON/NUSTAR AND SUZAKU/NUSTAR AGN CAMPAIGNS AS WELL AS SWIFT MONITORING CAMPAIGNS.ANOTHER IMPORTANT DIMENSION OF OUR WORK IS THE INTRODUCTION OF SPECTRAL AND SPECTRAL-TIMING MODELS OF X-RAY REFLECTION FROM BLACK HOLE DISKS THAT INCLUDE REALISTIC DISK THICKNESS (AS OPPOSED TO THE RAZOR-THIN DISKS ASSUMED IN CURRENT ANALYSIS TOOLS).THE ASTROPHYSICAL IMPLICATIONS OF OUR WORK ARE:(1) THE FIRST RIGOROUS DECOMPOSITION OF THE TIME-LAGS INTO THOSE FROM REVERBERATION AND THOSE FROM INTRINSIC CONTINUUM PROCESSES.(2) A NEW METHOD FOR DETERMINING THE DENSITY OF PHOTOIONIZED (WARM) ABSORBERS IN AGN THROUGH A MEASUREMENT OF THE RECOMBINATION TIME LAGS.(3) AGN BLACK HOLE MASS ESTIMATES OBTAINED PURELY FROM X-RAY DATA AND HENCE COMPLEMENTARY TO (OBSERVATIONALLY EXPENSIVE) OPTICAL BROAD LINE REVERBERATION CAMPAIGNS.(4) THE BEST POSSIBLE CHARACTERIZATION OF STRONG GRAVITY SIGNATURES IN THE REFLECTED DISK EMISSION.(5) DETECTION AND CHARACTERIZATION OF NON-TRIVIAL ACCRETION DISK STRUCTURE.EACH OF OUR TOOLS AND DATA PRODUCTS WILL BE MADE AVAILABLE TO THE COMMUNITY/PUBLIC UPON THE PUBLICATION OF THE FIRST RESULTS WITH THAT TOOL. THE PROPOSED WORK IS IN DIRECT SUPPORT OF THE NASA SCIENCE PLAN AND IS OF DIRECT RELEVANT AND SUPPORT TO NASA'S FLEET OF X-RAY OBSERVATORIES.