John C. Wagner is the group leader for the Radiation Transport and Criticality (RTC) Group in the Nuclear Science and Technology Division. He received a B.S in nuclear engineering from the University of Missouri-Rolla in 1992 and M.S. and Ph.D. degrees from the Pennsylvania State University in 1994 and 1997, respectively. His Ph.D. dissertation research focused on the development of a new code, A3MCNP, for automated variance reduction of Monte Carlo shielding calculations based on 3-D discrete ordinates adjoint functions. His M.S. thesis research involved detailed Monte Carlo and discrete ordinates analyses for reactor pressure vessel neutron fluence. Following graduate school, Dr. Wagner spent 2 years with Holtec International performing criticality safety analyses and licensing activities for spent fuel storage pools and storage and transportation casks, as well as providing oversight of shielding evaluations for storage and transport casks. He joined ORNL in 1999 and has since been involved in a variety of research and analysis activities, including burnup credit and criticality safety for spent fuel storage and transport, radiation shielding code development, development and application of automated variance reduction methods, spent fuel characterization, and radiation treatment planning simulations. In 2003, he became leader of the RTC group, where he coordinates the efforts of 21 technical staff members. Dr. Wagner's research interests include Monte Carlo and variance reduction methods, radiation shielding, burnup credit, criticality safety, and spent fuel characterization.