Daniel Weitzner is Director of the World Wide Web Consortium's Technology and Society activities and Co-Director at the MIT CSAIL Decentralized Information Group. He is responsible for development of technology that enables the Web to address legal and public policy requirements. Weitzner holds an appointment as Principal Research Scientist at MIT's Computer Science and Artificial Intelligence Laboratory, co-directs MIT's Decentralized Information Group with Tim Berners-Lee, and teaches Internet public policy at MIT. As a leading figure in the Internet policy community, he was the first to advocate user control technologies such as content filtering to protect children and avoid government censorship. These arguments played a critical role in the landmark Internet freedom of expression case in the United States Supreme Court, Reno v. ACLU (1997). In 1994, he won legal protections for email and web logs in the Electronic Communications Privacy Act. Weitzner holds an appointment as Principal Research Scientist at MIT's Computer Science and Artificial Intelligence Laboratory, co-directs MIT's Decentralized Information Group with Tim Berners-Lee, is a founding member of MIT's Center for Information Security and Privacy, and teaches Internet public policy at MIT. Weitzner was co-founder and Deputy Director of the Center for Democracy and Technology, and Deputy Policy Director of the Electronic Frontier Foundation. He serves on the Boards of Directors of the Center for Democracy and Technology, the Software Freedom Law Center, and the Internet Education Foundation.

Weitzner has a law degree from Buffalo Law School, and a B.A. in Philosophy from Swarthmore College. His writings have appeared in Science magazine, the Yale Law Review, Communications of the ACM, Computerworld, Wired Magazine, Social Research, Electronic Networking: Research, Applications & Policy, and The Whole Earth Review.