GUT implications from neutrino mass

An overview is given of the experimental neutrino mixing results and types of neutrino models proposed, with special attention to the general features of various GUT models involving intra-family symmetries and horizontal flavor symmetries. Many of the features are then illustrated by a specific SO(10) SUSY GUT model formulated by Barr and the author which can explain all four types of solar neutrino mixing solutions by various choices of the right-handed Majorana mass matrix. The quantitative nature of the modelʹs large mixing angle solution is used to compare the reaches of a neutrino super-beam and a neutrino factory for determining the small Ue3 mixing matrix element.