Deep multi-wavelength surveys, especially in the infrared, are
revealing a first comprehensive picture of galaxy assembly out to z>2.
An important discovery was the gradual mode and mass dependence of
star formation histories, a dominant mechanism of galaxy assembly out
to z>2, and, as I will show, likely beyond.  These data are improving
theoretical understanding of star formation in DM halos of different
masses at different epochs, and will reveal even more about the
physics of star formation when measurements of cold gas become
available from near-future telescope arrays.