Dan Ilas is an associate research and development staff member in the Radiation Transport and Criticality (RTC) Group in the Nuclear Science and Technology Division. He received an M.S. degree in engineering physics from the University of Bucharest, Bucharest, Romania, in 1986 and Ph.D. degree in nuclear engineering from Georgia Institute of Technology in 2001. His Ph.D. dissertation research focused on coarse mesh transport theory model for heterogeneous systems. His M.S. thesis research involved the study of two-photon processes for transitions discrete-continuum in hydrogen-like atoms. Dr. Ilas worked from 1986 to 1989 at the Institute for Nuclear Research, Pitesti, Romania, on CANDU reactors computational R&D. At the end of 1989, he joined the Institute for Nuclear Physics and Engineering, Bucharest, Romania, where he worked until September 1995 being involved on problems related to the decommissioning of the local VVR-S research reactor. In 1995, Dan entered the Ph.D. program at Georgia Tech. Upon graduation, he was assigned as a postdoctoral associate at Louisiana State University, where he worked mostly on computational methods for dose evaluations in radiation therapy. He had the opportunity to continue the medical physics work again at Georgia Tech for another year before joining Oak Ridge National Laboratory (ORNL). Dr. Ilas joined ORNL in 2004 and has since been investigating TORT integration into SCALE and Monte Carlo dosimetry modeling and computations for medical workers. His research interests include transport methods and software development for nuclear reactor core analysis, criticality and shielding, dose evaluation algorithms (photon and electron transport) for medical physics applications, and Monte Carlo detector response simulations using adjoint solutions to the transport equation. He is a member of the American Nuclear Society and Alpha Nu Sigma.