Deputy CIO for Cyberinfrastructure and Research IT, Division of Information Technology, University of Maryland
      
      Senior Director of Research, NVIDIA
      
      Director, University of Maryland Institute for Advanced Computer Studies (UMIACS)
      
      Office of High Performance Computing and Communications, National Library of Medicine, National Institutes of Health
      
      Information Technology Laboratory, NIST
      
      Founder, IGI Technologies
      
      Office of High Performance Computing and Communications, National Library of Medicine, National Institutes of Health
      
      Alumni Centennial Professor, Department of Physics and Astronomy, Johns Hopkins University.
      
      Associate Professor, Department of Biology and UMIACS, University of Maryland
      
      Professor, Department of Computer Science and UMIACS, University of Maryland
      
      Professor, Department of Mechanical Engineering and Institute for Systems Research, University of Maryland
      
      Professor, Department of Electrical and Computer Engineering and UMIACS, University of Maryland
      
      Department Chair, Minta Martin Professor of Aerospace Engineering, University of Maryland
      
      Associate Professor, Department of Chemical and Biomolecular Engineering, A. James Clark School of Engineering, University of Maryland
      
      Professor, Department of Electrical and Computer Engineering and UMIACS, University of Maryland
Associate Professor, School of Engineering and Applied Science, George Washington University
      
      Professor, Computer Science and UMIACS, University of Maryland
      
      Project Leader, ASC Production Visualization Project, Los Alamos National Laboratory
      
      Associate Professor, College of Information Studies and UMIACS, University of Maryland
      
      Computational Sciences Division, Army Research Laboratory
      
      Naval Research Laboratory
      
      ODNI/IARPA