The compelling experimental results on neutrino oscillation have convinced us of the existence of massive neutrinos. This success is the first indication for physics beyond the Standard Model and requires a new approach to the structure of masses and Yukawa couplings. Following a review on massive neutrinos, different GUT models based on SU(5), SO(10), and E_6 will be examined as theoretical frameworks from which a low energy effective theory, the Standard Model, emerges. We will introduce flavor symmetries, which are actual tools for constructing mass matrices in various gauge theories. Last, there will be detailed discussion on discrete abelian symmetries and gauged U(1) symmetries which we have employed as flavor symmetries.

In quantum chaology, the fluctuations of energy levels about their mean density are determined by the classical periodic orbits. These are different for integrable and chaotic systems, giving rise to the familiar universal Poisson and random-matrix spectral statistics. A third type of universality can arise in mixed systems, through semiclassical divergences associated with bifurcations (singularities) of periodic orbits. Each type of bifurcation, depending on one or more parameters, gives rise to a Planck's constant dependent power-law divergence in the moments of the counting function fluctuations. For each moment, different bifurcations compete, and the one with the strongest divergence dominates, leading to universal "twinkling exponents" - so named because they are analogous to exponents governing the wavelength-dependence of twinkling starlight, where the singularities are caustics.

Famous puzzles of quantum black holes are reviewed and recent progress towards adressing them in string theory is explained. The black hole setting provides a relatively concrete setting for illustrating advances in string theory. It also exposes the limitations of our present understanding and poses new challenges.

In the MSSM, fermion masses and Yukawa couplings receive radiative corrections from the supersymmetric particles. The corrections to down-type fermion masses and Yukawa couplings are enhanced by tan(beta) making them potentially very significant at large tan(beta). These corrections affect a wide range of processes, from Higgs phenomenology to rare B decays. In this talk I give a review of recent results involving these corrections and discuss their implications for various processes.

Indiana University has been chosen to lead the development of the distributed wide area infrastructure required by about 500 physicists from 30 universities and three Department of Energy laboratories. The development of this new computer network for particle physics is part of a multi-institutional initiative called the Grid Physics Network, or GriPhyN, an $11.9 million project funded by the National Science Foundation's Information Technology Research (ITR) initiative, a new $90 million program designed to maintain the nation's position as a world leader in technology.

The design being pursed is called a "virtual data grid" in which data, computer power, and network bandwidth are supplied without detailed involvement of the end user, much like a like an electrical power grid delivers energy to consumers who simply "plug in". Indiana University will specifically lead the U.S. portion of the data grid for the ATLAS experiment, one of two forefront particle physics experiments which will begin running in 2005 at the Large Hadron Collider (LHC) at CERN, the European Laboratory for Nuclear Physics Research in Geneva, Switzerland.

The project calls for a new collaborative effort between physicists, computer scientists and information technologists to develop smart new internet technologies. The IU team consists of researchers from the Department of Physics, the Department of Computer Science, the University Information Technology Services unit (UITS), and the Office of the Vice President for Information Technology (OVPIT).

Form Factors play an important role in understanding the dynamics of charm semileptonic decays. They are introduced as a part of hadronic currents, which describe the underlying strong force in the electroweak processes. Form factors can be understood within the framework of Heavy Quark Effective Theory(HQET). A study on 50% of the E831 Experiment Data has been carried. Preliminary results from this study will be presented.