SO(10) and Large nu_mu - nu_tau Mixing
  A general approach to understanding the large mixing seen in atmospheric neutrinos is explained, as well as a highly predictive SO(10) model which implements this approach. It is also seen how bimaximal mixing naturally arises in this scheme. (Talk presented at NNN99, SUNY Stony Brook, Sept. 22-26, 1999) 
S. M. Barr (Bartol) and C. H. Albright (FNAL)