We are saddened to learn today of the death of Professor Mark Poster. Poster was Emeritus Professor of History and Film & Media Studies at University of California Irvine, where he had worked since 1968. In 2006 we published his book Information Please: Culture and Politics in the Age of Digital Machines which advanced his critical project of theorizing the social and cultural effects of electronically mediated information. In the book Poster conceptualized a new relation of humans to information machines, a relation that avoids privileging either the human or the machine but instead focuses on the structures of their interactions. The Film and Media Studies department of Irvine offers a remembrance of him on their blog, and summarizes his importance in many fields: "Mark Poster was a major figure in the rapid development of media studies and theory in the USA and internationally. While as an intellectual historian he could draw on Frankfurt School thought as well as on cybernetics, he was particularly interested in the potential of poststructuralism for media studies. From his translations of Baudrillard to his dissemination of Foucault, Poster played a highly influential role in the study of media culture, including television, databases, computing, and the Internet; he continued to offer crucial commentary on the relevance to technology and media of cultural theory, and his numerous articles and books have been translated into a number of different languages." We send our condolences to his family, friends, and colleagues.