The CANDELS imaging survey with HST and its daughter grism survey 3DHST have together revolutionized our understanding of galaxy evolution after z ~ 3. Before these surveys, the prevailing paradigm was that massive galaxy evolution was rather random and driven in particular by major mergers, which were believed to be frequent at z~2. Mergers created elliptical galaxies from spiral disks and also triggered AGN by creating gas infall onto central black holes. CANDELS/3DHST have overturned this paradigm. Major mergers now appear to be a minor effect. Rather, massive galaxies evolve smoothly, with sizes, morphologies,and star-formation rates that are a function of mass at a given redshift.

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