His research interests include mobile and ubiquitous computing, distributed systems, context-aware operation, and electronic identification. He has more than 25 years’ experience working in the field of mobile computing. He served as the Editor-in-chief for IEEE Pervasive Computing from 2006-2009, and he is currently the Past Chair for ACM SIGMOBILE. To date, he has authored or co-authored more than 85 publications, with 100+ issued patents in this area.