He also holds many visiting positions including Air Force Research Laboratory in US, Microsoft Research Asia in China, Chuo University and Waseda University in Japan, Carnegie Mellon University in US, and University of Lille 1 in France. He has published over 100 peer-reviewed academic papers in leading international journals and conferences and several invited papers and book chapters, has edited or co-edited two books, has published two monographs, has served as reviewers or program committee members for many international journals and conferences, and has served as grant review panelists for several governmental and private funding agencies including NSF and NASA. His research is supported by federal and state governments, noticeably including NSF, AFOSR, and AFRL. He is associate editors and guest editors for several international journals. He is an IEEE Fellow.