Theodore Arabatzis is Professor of History and Philosophy of Science at the National and Kapodistrian University of Athens. He holds a Diploma in electrical engineering from Aristotle University of Thessaloniki, and an MA and a PhD in history of science from Princeton University. He has been awarded fellowships from Princeton, MIT and the Max Planck Institute for the History of Science. His research has focused on the history of modern physical sciences and on historical philosophy of science. He has published many articles in these areas in international journals and edited collections. He is the author of Representing Electrons: A Biographical Approach to Theoretical Entities (University of Chicago Press, 2006), co-editor of Kuhn’s The Structure of Scientific Revolutions Revisited (Routledge, 2012), co-editor of Relocating the History of Science: Essays in Honor of Kostas Gavroglu (Springer, 2015), and co-editor of Big Science in the 21st Century: Economic and Societal Impacts (IOP, 2023). He has served as co-editor of the journal Metascience (2010-2014). In 2017 he was awarded the IUHPST Essay Prize in History and Philosophy of Science by the International Union of History and Philosophy of Science and Technology, for his essay entitled "What’s in it for the historian of science? Reflections on the value of philosophy of science for history of science". In May 2019 he was elected corresponding member of the International Academy of the History of Science. He was president of the European Society for the History of Science (2020-2022).