His research interests include algorithms, protocols and security for Internet-scale networks and distributed systems. Lately, he has been gathering and analyzing million-node graphs from online social networks, and devising ways to protect user privacy in online and mobile social networks. He has been Program Co-chair for the International Workshop on Peer-to-Peer Systems (IPTPS 2006) and for the IEEE International Conference on Peer-to-Peer Computing (P2P 2010), and is a recipient of the NSF Career, MIT TR-35 Young Innovator and ComputerWorld Top 40 Tech Innovator awards.