Director, Intramural IT and Bioinformatics Program, National Institute of Neurological Disorders and Stroke (NINDS), National Institutes of Health (NIH), Bethesda, MD.

Member, NIH Executive IT Budget Advisory Committee (IT-BAC), Bethesda, MD.

Associate Editor, Computer Methods and Programs in Biomedicine, Elsevier Publisher. 

Co-Chair, NIH High Performance Computing and Network Working Group, Bethesda, MD.

Member, NIH Biomedical Informatics Coordination (BMIC) Working Group, Bethesda, MD

Professor

Co-Director, Center for Advanced Neurological Engineering, Institute for Neural Computation (INC) and Institute of Engineering in Medicine (IEM), University of California, San Diego (UCSD)

Associate Director, Swartz Center for Computational Neuroscience and Institute for Neural Computation (INC), UCSD

Adjunct Professor, Department of Bioengineering, UCSD

Adjunct Professor, Department of Computer Science and Department of Electrical Engineering, National Chiao Tung University, Hsinchu, Taiwan

Adjunct Professor, School of Precision Instrument and Opto-electronic Engineering, Tianjin University, Tianjin, China

Assistant Professor, Electrical Engineering and Computer Science, Case Western Reserve University, USA

Director, Mobile Health Laboratory and the Sensing and Interaction Laboratory

Investigator, the Advanced Platform Technology Center (APTC), a Department of Veterans Affairs Research Center in the Rehabilitation Research and Development Service, focused on the development of new medical/health technologies to improve function of patients with motor function impairment and disability. 

Professor, Department of Computer Science at the University of Calgary, Alberta, Canada.

He published over 300 papers in refereed international journals and conferences. He served on the program committee of several international conferences. He is founding editor in chief of the Springer Journal of Social Networks Analysis and Mining, founding editor of Springer Series 'Lecture Notes on Social Networks', Associate Editor of IEEE SMC- Part C and he is member of the editorial board of the Journal of Information Assurance and Security, Journal of Data Mining and Bioinformatics, Journal of Data Mining, Modeling and Management; he has been guest editor for a number of special issues and edited a number of conference proceedings.