Study in this area focuses on computational neutral particle transport applied to nuclear reactors, radiation shielding, and nuclear security and non-proliferation challenges. There is ongoing research in methods and algorithms for solving the Boltzmann transport equation more effectively. These methods are often inspired by the physics of the problem at hand, developments in computer hardware, or both. Ongoing work involves: deterministic solution methods, Monte Carlo methods, and hybrid methods in which deterministic solutions are used to accelerate Monte Carlo solutions. We investigate a variety of methods applied to a variety of systems. Much of our work is open source, though we frequently collaborate with national laboratories directly in their code bases.