  We present a brief discussion of the evolution of disk galaxy stellar masses,
sizes, rotation velocities, and star formation rates over the last eight
billion years. Recent observations have failed to detect significant evolution
in the stellar mass Tully-Fisher relation, stellar mass-size relation, and the
stellar mass function of disk galaxies. Yet, most z<1 star formation is in
disks, and this star formation would be expected to drive a rapid growth of the
total stellar mass (and therefore mass function) of disks in the last eight
billion years. Such a build-up is not seen; instead, a rapid build-up in the
total stellar mass in non-star-forming spheroid-dominated galaxies is observed.
Large numbers of disk-dominated galaxies are systematically shutting off their
star formation and building up a spheroid (or losing a disk) in the epoch
0<z<1.
