Sybille Krämer is emerita professor for philosophy at the Free University Berlin. Since her retirement she has been a guest professor at the Institute for Cultures and Aesthetics of Digital Media at Leuphana University, Lüneburg. She held several international visiting professorships and fellowships, and she holds an Honorary Doctorate from Linköping University in Sweden. Her publications in English include: Books: Media, Messenger, Transmission. An Approach to Media Philosophy (2015), (co-ed.), Thinking with Diagrams – The Semiotic Basis of Human Cognition (2016), (co-ed.), Testimony/Bearing Witness. Epistemology, Ethics, History, Culture (2017).