Sofia Martins Geraldes holds a PhD in History, Studies of Security and Defense, from ISCTE-IUL in a partnership with the Military Academy, with the title "The balance between effectiveness and proportionality in responding to Online Disinformation at crossroads: An analysis of the response of the European Union through security governance, 2015-2022". During the PhD she got a scholarship from FCT. She worked in the External Affairs Department of OGMA-Aeronautical Industry of Portugal as Political Analyst. She was the Founder and Coordinator of EuroDefense-Jovem at the EuroDefense-Portugal Association. She was trainee at the National Defence Institute, and, in 2014, she collaborated in the planning and coordination of the Second Module of High Level Course, in Lisbon, within the framework of the European Security and Defence College. Furthermore, she was involved, as project manager, in some research projects, namely MAPLE (at ICS-University of Lisbon), funded by the European Research Council. She holds a BA in Political Science and International Relations and a MA in International Relations from the University of Beira Interior. Her main research interests are: International Relations Theory, Security Studies, Information Operations, Online disinformation on social media, Cyberspace and Contemporary Conflict, European Union and NATO.