This symposium brings together academia, government, and industry to explore all aspects of identity and trust. Previously known as the PKI R&D Workshop (2002-2007), our new name reflects interest in a broader set of tools and the goal of an identity layer for the Internet. We aim to get practitioners in different sectors together to apply the lessons of real-world deployments to the latest research and ideas on the horizon. In addition to peer-reviewed papers, we facilitate discussions among panels of invited experts and symposium participants.