David Hollar, PhD is an Assistant Professor in the Department of Medicine, University of North Carolina School of Medicine, Chapel Hill. At UNC, he designs and analyzes educational research projects involving assessments of medical student and resident performances in simulated environments. He also performs epidemiological research on risk behaviors and diagnostic health conditions for persons with disabilities, using secondary longitudinal clinical and public health databases. He is an active member of the American Educational Research Association, the American Public Health Association (Disability Section), and is a member of the editorial board of the Maternal and Child Health Journal, published by Springer.