My research focuses on algorithms and networks, the roles they play in large-scale social and information systems, and their broader societal implications. My work has been supported by an NSF Career Award, an ONR Young Investigator Award, a MacArthur Foundation Fellowship, a Packard Foundation Fellowship, a Simons Investigator Award, a Sloan Foundation Fellowship, a Vannevar Bush Faculty Fellowship, and grants from Facebook, Google, Yahoo, the MacArthur and Simons Foundations, and the AFOSR, ARO, and NSF. I am a member of the National Academy of Sciences, the National Academy of Engineering, the American Academy of Arts and Sciences, and the American Philosophical Society.