Overview: The Nancy Grace Roman Space Telescope will be one of the most powerful facilities for weak lensing cosmology ever built, with the angular resolution, stability, and infrared sensitivity afforded by space-based observations. Forecasts imply that the weak gravitational lensing (WL) in a ~2000 sq. deg. high latitude imaging survey (HLIS) with Roman can measure the amplitude of matter fluctuations with an order of magnitude improvement in precision over current measurements. Delivering on this promise is an enormous challenge, requiring comparable improvements both the control of instrumental and astrophysical systematics, and the accuracy of model predictions. Our program of infrastructure development will enable the Roman HLIS to achieve its extraordinary cosmological potential, while simultaneously providing unprecedented volumes of exquisite data for an extensive range of astrophysical investigations. The PI of this PIT is Olivier Dore (JPL). Dan Masters from IPAC will focus on redshift measurement and calibration.