Academics and practitioners with an interest in the concept of (tele)presence are invited to submit their work for presentation at the 12th Annual International Workshop on Presence, to be held in Los Angeles, California on November 11-13, 2009. Often described as a sense of "being there" in a mediated environment, telepresence is broadly defined as a psychological state or subjective perception in which a person fails to accurately and completely acknowledge the role of technology in an experience. It is a rich, fascinating subject of scientific investigation, artistic exploration and diverse application, with increasingly important implications for the ways in which people work, play and live, and technologies are developed.