His research interests are in the area of computer networking with emphasis on design, measurements, analysis, denial-of-service resiliency, and prototype implementation of protocols and algorithms for the Internet. He is most well-known for his pioneering work on low-rate denial-of-service attacks, TCP congestion control, and data sharing methods for Internet-scale systems. He has published more than 40 research papers in the most prestigious networking journals and conferences. He received the NSF CAREER Award. He is a member of the steering committee of the Measurement Lab, an open platform for monitoring net neutrality. He is a member of the advisory board of Narus, Inc and a co-founder of several startups.