This proposal requests continuing support for a program of research aimed at the unification of quantum mechanics and gravity. The program follows two distinct approaches: string theory and M-theory on the one hand; and noncommutative geometry on the other. The string theory approach involves such areas as supersymmetry, black holes, and branes, and the Co-PI involved in this effort is an acknowledged expert in the study of black holes. The noncommutative geometry approach considers the possibility that at extremely small, sub-Planckian distances space becomes quantized; the PI is one of the early pioneers of this approach and contributed to the foundations of it. <br/><br/>The broader impacts of this work lie in the area of education and research development in an under-developed region of the world, and they may have important consequences for related fields such as particle physics phenomenology and cosmology.