Dr. von Davier is a Distinguished Research Scientist at the National Board of Medical Examiners (NBME) in Philadelphia. Previously, he was a Senior Research Director in the Research & Development Division at Educational Testing Service (ETS). In addition, he was the co-director of the Center for Global Assessment at ETS, where he led psychometric research and operational analysis for assessments such as PISA, PIAAC, TIMSS and PIRLS. His current work focuses on extending, implementing and applying multidimensional IRT, IRTree, and latent response models. Additionally, he also builds speed and accuracy models to process data research using log-file and timing data using data from large scale tests.