Bradley T. Rearden is a senior research and development staff member in the Radiation Transport and Criticality Group in the Nuclear Science and Technology Division. He received B.S., M.S., and Ph.D. degrees in nuclear engineering from Texas A&M University in 1993, 1995, and 1999, respectively. Dr. Rearden joined ORNL in 1999 and has since been involved in a variety of research and development activities, especially involving the Tools for Sensitivity and Uncertainty (S/U) Analysis Methodology Implementation (TSUNAMI) software for SCALE, for which he is the code manager and primary developer. He leads the development of S/U capabilities in the KENO Monte Carlo codes for criticality safety, post-processing tools for uncertainty quantification and code validation, numerous graphic user interfaces, and interactive HTML-formatted output. In addition to development work, Dr. Rearden is the lead instructor for the TSUNAMI training courses and implements the TSUNAMI techniques in numerous application studies for government and industry. He is an active member of the American Nuclear Society.