Per Högselius is Professor of History of Technology at KTH Royal Institute of Technology, Stockholm. He holds a MSc in Engineering Physics, a PhD in Innovation Studies and a Docent (Habilitation) degree in History of Science and Technology. He specializes in transnational studies of energy and infrastructures in historical perspective, with a particular emphasis on East-West relations. Achim Klüppelberg is a doctoral candidate in History of Science, Technology and Environment at KTH Royal Institute of Technology in Stockholm. He holds a BA in History and Political Science (2013) and an MA in Eastern European History (2016), both from the University of Göttingen, Germany. His studies also included a longer stay at the Russian State University for the Humanities (RGGU). His doctoral project focuses on the on the nuclear history of the Soviet Union and its successor states. He is a member of the German Society of Historians and the Society of Historians for Eastern Europe.