  We present the results of ground-based and HST imaging studies targeted on
z>4.5 quasar fields. High-redshift galaxies identified in deep narrow-band
Lyman alpha images of the fields surrounding the quasars BR1202-0725 (z=4.694)
and BR2237-0607 (z=4.558) have been confirmed with follow-up spectroscopy using
the LRIS spectrograph on the Keck 10m telescope. These high-redshift galaxies
are typically only moderately luminous objects and their sub-L* magnitudes
imply star formation rates of only a few solar masses per year. For BR1202-0725
tip-tilt imaging in Lyman alpha at the UH 2.2m telescope and deep narrow-band
IR imaging in [OII] at CFHT reveals a complex and structured system which may
be merging to produce the host galaxy of the quasar. For BR2237-0607 the
Lyman-alpha-emitting galaxies show the strong Lyman alpha emission and weak
continuum expected for objects before substantial chemical enrichment and
consequent dust formation and extinction has occurred. These objects appear to
be galaxies in their first outburst of star formation.
