Our current data ecosystem leaves individuals, groups, and society vulnerable to a wide range of harms, ranging from privacy violations to subversion of autonomy to discrimination to erosion of trust in institutions. In this talk, the Data Co-ops Project, a multi-institution, multi-disciplinary effort co-led with Kobbi Nissim will be discussed. The Project seeks to organize our understanding of these harms and to coordinate a set of technical and legal approaches to addressing them. In particular, recent joint work with Ayelet Gordon and Alex Wood will be presented, wherein we argue that legal and technical tools aimed at controlling data and addressing privacy concerns are inherently insufficient for addressing the full range of these harms. Bio: Katrina Ligett is a professor in the School of Computer Science and Engineering at the Hebrew University, where she is also the head of the program on the Interfaces of Technology, Society, and Networks (formerly known as Internet & Socie