Thomas M. Miller is a research and development staff member of the Radiation Transport and Criticality (RTC) Group within the Nuclear Science and Technology Division (NSTD) at Oak Ridge National Laboratory (ORNL). He received a B.S, M.S., and Ph.D. all from the University of Tennessee in 1999, 2001, and 2004, respectively. His Ph.D. dissertation, which was sponsored by NASA’s Marshal Space Flight Center (MSFC) in Huntsville, Alabama, via NASA’s Graduate Student Research Program (GSRP), involved creating an event generator to model the particle production of nucleus-nucleus collisions for nuclei as heavy as lead with energies up to 22.5 GeV. This event generator was then incorporated into the code HETC, which is a high energy proton and neutron Monte Carlo radiation transport code, to create HETC-HEDS. While working on his M.S. degree, he was a graduate research assistant in the Applied Physics Group in the Computational Physics and Engineering Division of ORNL. His master's thesis involved performing bulk shielding design calculations with S_N and Monte Carlo methods for the Spallation Neutron Source (SNS) around the mercury target and along the neutron beam lines. This work assisted in the design of the neutron beam line shutters and uninstrumented neutron beam line plugs. After graduate school, Dr. Miller worked at the Bettis Atomic Power Laboratory in West Mifflin, Pennsylvania, in the Shield Design and Development Group. At Bettis, he used S_N and Monte Carlo codes to design shielding for the U. S. Naval Reactors Program, developed tools to create high order arbitrarily biased quadratures, and was the Bettis lead shielding design engineer for NASA’s JIMO/Prometheus Project. Dr. Miller joined the RTC Group in October 2006. His research interests include deterministic and Monte Carlo transport methods, particularly for charged particle transport, criticality safety, and radiation shielding. Specific examples include investigating active interrogation techniques for the detection of nuclear material in maritime environments, and design of a passive activation detector and software system for use in post nuclear detonation forensics. He is an active member of the local and national American Nuclear Society (ANS), and is a member of the ANS Mathematics and Computation, Nuclear Criticality Safety, Radiation Protection and Shielding, and Aerospace Nuclear Science and Technology Divisions.