THOUGH THOUSANDS OF EXOPLANETS HAVE BEEN DISCOVERED ONLY A FEW OF THE MOST MASSIVE EITHER AT VERY CLOSE OR VERY WIDE SEPARATIONS ARE AMENABLE TO SPECTROSCOPIC CHARACTERIZATION. THE REST ARE OBSERVED ONLY THROUGH THEIR EFFECTS ON THEIR HOST STARS: THEIR ORBITS MASSES AND/OR RADII ARE ALL THAT IS KNOWN. BY OBTAINING SPECTRA OF MASSIVE WIDE-SEPARATION PLANETS WE CAN PROBE THEIR ATMOSPHERIC CHEMISTRY AND ABUNDANCES CONSTRAIN THEIR SURFACE GRAVITIES (AND HENCE THEIR MASSES) AND INFER THEIR HEAT SUPPLY AT FORMATION. SPECTROSCOPIC CHARACTERIZATION CAN RESOLVE THE CONTROVERSY OVER HOW THESE PLANETS FORMED AND ENABLE US TO UNDERSTAND THE PHYSICAL STATE OF THEIR ATMOSPHERES INCLUDING TEMPERATURE AND PRESSURE PROFILES AND THE FORMATION OF CLOUDS AND HAZES. THE SAME TECHNIQUES WILL ULTIMATELY PROVIDE A WAY TO SEARCH FOR NONEQUILIBRIUM CHEMISTRY IN THE ATMOSPHERES OF ROCKY PLANETS A POTENTIAL SIGNATURE OF LIFE. WE PROPOSE TO USE THE NEW INSTRUMENTS SCEXAO AND CHARIS ON THE SUBARU TELESCOPE TO (1) CONDUCT A SURVEY FOR NEW EXOPLANETS AROUND NEARBY YOUNG STARS VISIBLE FROM THE NORTHERN HEMISPHERE (2) OBTAIN CALIBRATE AND CHARACTERIZE SPECTRA OF KNOWN AND NEWLY-DISCOVERED PLANETS AND (3) USE THESE SPECTRA TO INFER PLANET PROPERTIES AND CONNECT THEM TO THEORIES OF GIANT PLANET FORMATION. CHARIS HAS THE BROADEST SIMULTANEOUS BANDPASS OF ANY INSTRUMENT IN ITS CLASS WHICH ENABLES US TO DISTINGUISH DIFFRACTED STARLIGHT FROM THE LIGHT OF FAINT EXOPLANETS CLOSE TO THEIR STARS. SCEXAO'S USE OF INCOHERENT SATELLITE SPOTS (JOVANOVIC ET AL. 2015) WILL ENABLE US TO ACCURATELY CALIBRATE THE POSITION AND BRIGHTNESS OF PLANETS. SPECTRA OBTAINED WITH THE AID OF HIGH-CONTRAST IMAGING ARE BY THEIR NATURE DIFFICULT TO CALIBRATE AND CHARACTERIZE. THIS MAKES PROPER STATISTICAL COMPARISONS WITH THEORETICAL SPECTRA IMPOSSIBLE AND MAKES IT DIFFICULT TO INFER THE PLANETS' CHEMISTRY AND ATMOSPHERIC CONDITIONS. PUBLISHED EXOPLANET SPECTRA HAVE USED HIGH-PASS FILTERS (KONOPACKY ET AL. 2013) GENERICALLY OMIT COVARIANCES AND HAVE USED A RANGE OF EXTRACTION ALGORITHMS IN AN ATTEMPT TO UNDERSTAND SYSTEMATIC UNCERTAINTIES (MACINTOSH ET AL. 2015). OUR RESEARCH PROGRAM WILL COMBINE NEW EXTRACTION ALGORITHMS WITH SCEXAO'S CALIBRATION CAPABILITIES TO ENABLE DEEPER SEARCHES FOR NEW PLANETS AND STATISTICALLY RIGOROUS COMPARISONS OF OBSERVED SPECTRA WITH THEORETICAL MODELS. THESE COMPARISONS ARE THE ONLY WAY TO INFER THE EXOPLANETS' CHEMICAL ABUNDANCES WHICH COULD POINT TO THE LOCATIONS IN THE PROTOPLANETARY DISK WHERE THE PLANETS FORMED. OUR OBSERVED AND CALIBRATED SPECTRA WILL PROVIDE MUCH-NEEDED TESTS OF THEORETICAL MODELS OF EXOPLANET AND BROWN DWARF ATMOSPHERES WHILE THE ALGORITHMS AND STATISTICAL TECHNIQUES WE DEVELOP WILL BE APPLICABLE TO DATA FROM JWST AND FROM FUTURE MISSIONS LIKE WFIRST HABEX AND LUVOIR.