  We combine HST WFPC mosaics of clusters at multiple redshifts with Keck LRIS
spectroscopy to characterize different galaxy populations and how they evolve.
By combining quantitative measurements of structural parameters with velocity
dispersions, line indices, and morphological types, we attempt to establish
links between ellipticals, S0's, E+A's, and later type galaxies. Here we focus
on galaxies in CL1358+62, a massive cluster at z=0.33.
