His research interests are the development of analytic and computational methods for nuclear reactor, neutron transport, nonlinear radiative transfer, electron transport and medical physics problems. (Essentially, anything concerning radiation interactions with matter.) His theoretical work involves the derivation of exact, asymptotic, and computational solutions and the analysis of their mathematical and physical properties. His applied work involves (a) the development of approximation theories for special types of transport phenomena, (b) the implementation and testing of numerical approximation schemes and iteration methods for deterministic transport problems and (c) the implementation and testing of variance reduction schemes for Monte Carlo problems.
