Studying the nature of the first generation of galaxies to form in the Universe is central to efforts to understand the earliest phases of galaxy evolution and the physical processes driving cosmic reionization. Building on my recent success investigating galaxy evolution at redshifts z>6, I propose to recruit and lead the research team necessary to fully exploit my involvement in two Hubble Space Telescope (HST) imaging programmes focused on the high-redshift Universe. The first of these is a new, ultra-deep, proprietary imaging programme in the Hubble Ultra-Deep Field (on which I am co-PI) which will deliver the deepest near-IR image ever obtained and the first robust sample of z>9 galaxies. This dataset will produce the definitive measurement of the faint-end of the high-redshift galaxy luminosity function in the pre-JWST era, a key observationalconstraint necessary for understanding reionization. The second HST programme is the on-going, wide-area, CANDELS imaging survey, which will provide the first statistically significant sample of massive galaxies at redshifts 6

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