He has served as the Chair of the ACM Special Interest Group on Multimedia and as General Chair of numerous conferences, including IEEE ICNC 2016, ACM MSWIM 2015, ACM MobiCom 2008, IEEE SECON 2005, ACM Multimedia '93, and ACM SIGCOMM '88. He has also served as Program Chair of ACM MobiHoc 2002, ACM MobiCom 2000, IEEE MULTIMEDIA '92, ACM SIGCOMM '87, and ACM SIGCOMM '86. He has served in the IEEE Internet Technology Award Committee, the IEEE Richard W. Hamming Medal Committee, and the National Research Council Panel on Digitization and Communications Science of the Army Research Laboratory Technical Assessment Board.