His research interests broadly span the areas of distributed systems, networking, and security and privacy. Many of the systems developed as part of his research have been widely used and have had significant impact. For example, WhyHigh has reduced latencies to Google by an order of magnitude for millions of users, the MyPageKeeper system for detecting social malware is in use by over 20,000 Facebook users, and Internet topology and performance data from the iPlane system has been used in research projects at over 100 institutions. His work has also resulted in award papers at the USENIX NSDI and ACM SIGCOMM IMC conferences. His research is supported by the Army Research Laboratory (ARL), the Defense Threat Reduction Agency (DTRA), Amazon, VMware, a Google Research award, a NetApp Faculty Fellowship, and an NSF CAREER award.