  We measure the build-up of the stellar mass of galaxies from z=6 to z=1.
Using 15 band multicolour imaging data in the NICMOS Ultra Deep Field we derive
photometric redshifts and masses for 796 galaxies down to H_AB=26.5. The
derived evolution of the global stellar mass density of galaxies is consistent
with previous star formation rate density measurements over the observed range
of redshifts. Ongoing research in the CFHTLS Deep Fields confirms this result
at lower redshifts. Further, if the sample is split by morphological type, a
substantial increase is seen in the number of bulge dominated galaxies relative
to disk-dominated galaxies since z=1.
