Heinz von Foerster (1911–2002) completed his studies of physics in Vienna and worked at different research labs before emigrating to the United States in 1949. In 1957, at the University of Illinois, he established the Biological Computer Lab (BCL) – the cradle of the epistemology that would later cause a stir under the label of "constructivism." The focus was on analyzing the logical and methodological problems that in evitably arise when one seeks to know knowledge. He is the author of numerous books, including Understanding Understanding: Essays on Cybernetics and Cognition. Bernhard Poerksen is professor of media studies at the University of Tübingen with a particular research interest in the new media age. His books about systemic thinking have been translated into many languages. In 2008 he was voted "Professor of the Year" in honor of his teaching. His most recent book publications in English include From Being to Doing: The Origins of the Biology of Cognition (with Humberto Maturana), The Unleashed Scandal: The End of Control in the Digital Age (with Hanne Detel), and Digital Fever: Taming the Big Business of Disinformation.