Kim-Vy Tran (Leiden Observatory, CfA)
        The Origin of Early-Type Galaxies in Rich Clusters

Abstract:  I summarize results from our multi-wavelength studies of two
rich galaxy clusters at z=0.59 and 0.83, and a unique protocluster at
z=0.37. Using wide-field imaging from HST, extensive spectroscopy from
the VLT and Keck, and deep X-ray imaging from Chandra, I illustrate the
important roles galaxy accretion and galaxy-galaxy merging play in
cluster assembly and early-type formation. Combining our results with
studies at lower redshifts enables us to better trace the lineage of
early-type galaxies in nearby clusters such as Coma.