Mark Handley is Professor of Networked Systems in the Department of Computer Science of University College London since 2003, where he leads the Networks Research Group. He holds a Royal Society Wolfson Research Merit Award as well as a Roger Needham Award. He was the recipient of the 2012 IEEE Internet Award "For contributions to Internet multicast, telephony, congestion control and the shaping of open Internet standards and open-source systems in all these areas."
While at the International Computer Science Institute (ICSI), he co-founded the AT&T Center for Internet Research, as well as the XORP open-source router project (2000).
Handley is a member of the Internet Engineering Task Force (IETF) Routing Area Directorate and the Transport Area Directorate. Previously he was a member of the Internet Architecture Board (IAB) and chaired the IETF Multiparty Multimedia Session Control working group and the IRTF Reliable Multicast Research Group. He is the (co-)author of 34 RFCs, including the , Multipath TCP and a series of other network protocols.