Matthew Delmastro is a former Program Assistant at GMF.
German
Corinna Blutguth is a program manager in GMF's Berlin office. She coordinates programming and research on U.S.-German relations, transatlantic security, and German domestic and foreign policy. Before joining GMF, Corinna worked as a program officer for a public-private-partnership of the German Federal Foreign Office, the Robert Bosch Foundation, and the German Council on Foreign Relations. She also gained experience working for the Kolleg-Forschergruppe Transformative Power of Europe at Freie Universität Berlin. Corinna holds a master's degree in political science from the University of Potsdam and studied European Studies in Magdeburg and Brno. Next to her native German, she speaks English and Spanish and has a basic knowledge of French and Czech.
Sophie Arts leads GMF’s research and programming on Arctic security and geopolitics, and on North American and Nordic defense against conventional and hybrid threats. As a Washington, DC-based fellow within the Transatlantic Security program, she also works on North American continental and US homeland defense, allied cooperation in NATO and other formats, and Russian and Chinese strategic objectives and activities in the Arctic and adjacent theaters.
Arts joined GMF’s security and defense policy team in 2017. Previously, she worked at the Atlantic Council, GMF Brussels, Spiegel Online International, and Kantar Media. Her prior research covered NATO’s partnerships and flexible formats, the impact of emerging technologies on allied defense and deterrence, the dynamics of escalation within the cyber domain, and strategic stability in a multipolar world.
Her writings and commentaries are featured regularly in defense publications and international media. She is a member of The European Centre of Excellence for Countering Hybrid Threats’ pool of experts. In 2025, she served as co-chair of the task force for global peace and security for the Think7, the official G7 group that brings together the world’s leading think tanks and research centers.
Arts holds a master’s degree from Humboldt University in Berlin and a bachelor’s degree from the University of Freiburg.
Melanie Whittaker is a former Head of Membership & Development, Leadership Programs at GMF.
Tobias Spöri is a former Visiting Fellow at GMF.
Etienne Soula is a Brussels-based research fellow with the South and Wider Europe Program at GMF. His research focuses on hybrid threats and economic security. He tracks how authoritarian actors use technology and infrastructure exports, supply chains, and investment to create dependencies and reshape global information spaces. He works across policy communities on both sides of the Atlantic and regularly briefs officials, lawmakers, and members of the media on approaches to authoritarian coercion and influence in Europe and the United States. Soula previously held positions at the Carnegie Endowment for International Peace, the Hudson Institute, and NATO. He holds a dual master’s degree in international affairs from American University and the Université Libre de Bruxelles, and a law degree from the University of Nottingham.
Annika Vollmer is a Brussels-based senior program coordinator for GMF’s Leadership Programs. She oversees the EU-US Young Leaders Seminar, and designs and implements other programs, including the Marshall Memorial Fellowships, the Transatlantic Inclusion Leaders Network, and the Schuman Challenge. All the programs foster skills development, critical thinking, and cross-cultural understanding among next-generation leaders.
Fluent in German and English, Vollmer holds a master’s in international relations with a specialization in security studies from Leiden University and a bachelor’s degree in European studies from Maastricht University.
Gesine Weber is a former Fellow at GMF.