He received his Ph.D. in Computer science from MIT in 2005, and his S.B. and M.Eng. degrees in Electrical Engineering and Computer Science from MIT in 2000 and 2001, respectively. His research focuses on many aspects of computer networking and networked systems, including the design, measurement, and analysis of network routing protocols, network operations and security, and anonymous communication systems. In December 2008, he received the Presidential Early Career Award for Scientists and Engineers (PECASE) for his contributions to cybersecurity, notably spam filtering. His honors also include a Sloan Research Fellowship, the NSF CAREER award, Technology Review's TR35 award, the IBM Faculty Fellowship, and award papers at SIGCOMM 2006, the NSDI 2005 conference, Usenix Security 2002 and Usenix Security 2001.