Dr. Malec is Professor and Research Director in the IUSM Department of PM&R and RHI, Professor Emeritus of Psychology at the Mayo Clinic, and Board Certified in Clinical Neuropsychology and Rehabilitation Psychology. Dr. Malec directed the Mayo TBIMS from 1999 through 2007. Relevant to the proposed work, for the past 20 years he has been a leader and advocate for the use of modern item-response theory (IRT) techniques in developing rehabilitation metrics.