  We review the current status of the data on neutrino masses and lepton mixing
and the prospects for measuring the CP-violating phases in the lepton sector.
The possible connection between low energy CP violation encoded in the Dirac
and Majorana phases of the Pontecorvo-Maki-Nakagawa-Sakata mixing matrix and
successful leptogenesis is emphasized in the context of seesaw extensions of
the Standard Model with a flavor symmetry Gf (and CP symmetry).
