Research Assistant, Department of Radiology, School of Medicine, University of Michigan, Ann Arbor, 09/99-07/00 Research Assistant, Department of Biomedical Engineering, School of Medicine, Johns Hopkins University, 09/00-11/05 Research Associate, Department of Radiology, School of Medicine, Johns Hopkins University, 11/05-07/07 Assistant Professor, Advanced Imaging Research Center, University of Texas Southwestern Medical Center, 08/07-now