• Editor

  IEEE Transactions on Wireless Communications, 2002 -- 2005

  IEEE Transactions on Mobile Computing, 2003 -- 2008

  Journal on Vehicular Technology, 2006 --

  Journal of Distributed Sensor Networks, 2007 --

• Guest Editor, ACM MONET special issues on Heterogeneous Wireless Networks, 2006
  Journal of Wireless Information Networks special issue on wireless sensor networks, Springer, 2006
  Ad Hoc Networks special issue on privacy and security in wireless sensor and ad hoc networks, 2009
• TPC Chair: IEEE Symposium on Reliable Distributed Systems (SRDS), 2009
  TPC Vice Chair: IEEE ICDCS 2009
  TPC Area Chair: IEEE Infocom 2008
  General Chair: Int'l Conf. on Mobile and Ubiquitous Systems (MobiQuitous), 2007
  TPC Vice Chair: IEEE Int'l Conf. on Mobile Ad-hoc and Sensor Systems (MASS), 2005
  TPC Co-Chair: International Workshop on Mobile Distributed Computing (MDC), in conjunction with ICDCS, 2003, 2004, 2005, 2007.
• Program Committee Member

  ACM MOBICOM 2004 -- 2008

  IEEE INFOCOM 2004, 2005, 2007 -- 2009

  ACM MOBIHOC 2008, 2009

  IEEE Int'l Conf. on Distributed Computing Systems (ICDCS), 2001 -- 2004, 2008-2009

  IEEE Int's Conf. on Pervasive Computing and Communications (PerCom), 2005--2009

  IEEE Conf. on Sensor, Mesh, and Ad Hoc Communications and Networks (SECON), 2006 -- 2009

• Session chair: ICDCS'02, INFOCOM'04, INFOCOM'05, SECON'04, MOBICOM'06, INFOCOM'07, Mobihoc'08. Local arrangement chair: MOBICOM'04. Finance chair: MOBICOM'05.
• NSF Panel: 2001, 2002, 2003, 2004 (two panels), 2005 (three panels), 2006 (two panels), 2007 (two panels), 2008 (three panels). Also review proposals for Army Research Lab, NIH, and Hong Kong Research Council.