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A deep all-sky imaging hard x-ray survey and wide-field monitor is needed toextend soft (ROSAT) and medium (ABRIXAS2) x-ray surveys into the 10-100 keVband (and beyond) at comparable sensitivity (~0.05 mCrab). This would enablediscovery and study of >3000 obscured AGN, which probably dominate the hardx-ray background; detailed study of spectra and variability of accreting blackholes and a census of BHs in the Galaxy; Gamma-ray bursts and associatedmassive star formation (PopIII) at very high redshift and Soft Gamma-rayRepeaters throughout the Local Group; and a full galactic survey for obscuredsupernova remnants. The Energetic X-ray Imaging Survey Telescope (EXIST) is aproposed array of 8 x 1m^2 coded aperture telescopes fixed on the InternationalSpace Station (ISS) with 160deg x 40deg field of view which images the full skyeach 90 min orbit. EXIST has been included in the most recent NASA StrategicPlan as a candidate mission for the next decade. An overview of the sciencegoals and mission concept is presented.Comment: 5 pages LaTeX. To appear in Proc. 5th Compton Symp. (M. McConnell,  ed.; AIP Conf. Proc.

EXIST: A high sensitivity hard x-ray imaging sky survey mission for ISS