He was previously a post-doctoral fellow at the Stanford Computer Science department and a Junior Affiliate Scholar at the Stanford Law School Center for Internet and Society. He studies privacy from a multidisciplinary perspective, focusing on the intersection between technology, law and policy. His research has shown that data anonymization is broken in fundamental ways, for which he jointly received the 2008 Privacy Enhancing Technologies Award. He is one of the researchers behind the “Do Not Track” proposal.