  We present H-band observations of gravitationally lensed QSO host galaxies
obtained with NICMOS on HST as part of the
CfA-Arizona-Gravitational-Lens-Survey (CASTLES). The detections are greatly
facilitated by the lensing magnification in these systems; we find that most
hosts of radio-quiet QSOs (RQQ) at z~2 are of modest luminosity (L<L_*). They
are 2-5 times fainter than the hosts of radio-loud QSOs at the same epoch.
Compared to low redshifts, RQQ hosts at z~2 also support higher nuclear
luminosities at given stellar host mass. This suggests that the supermassive
black holes at their centers grew faster at early epochs than the stellar body
of their surrounding host galaxies.
