  Superheavy neutrinos can, via the seesaw model, provide a mechanism for
lepton number violation. If they are combined with flavor violation as
characterized by the Froggatt-Nielsen mechanism, then the phenomenology for the
neutrinos in oscillation experiments, neutrinoless double beta decay, and other
experiments can be described by a relatively few number of parameters. We
describe the low-energy neutrino mass matrix and show that the results are
consistent with currently available data.
