Ambassador Brent Hardt is a resident senior fellow at GMF who brings 35 years of experience leading at all levels of government. He has guided five embassies as ambassador, chargé d’affaires, and deputy chief of mission, and served as foreign policy advisor to US Central Command and US Special Operations Command, working closely with allies to meet vital security challenges. As professor and senior advisor at the US Naval War College, he taught national security strategy and policy and developed a seminar on the evolution of modern Europe.

Hardt joined the US Foreign Service in 1988, serving in Berlin, the Hague, Rome, Paris, Canada, and the Caribbean. He was an exchange diplomat with the Netherlands Ministries of Foreign Affairs and Defense in 1993. In Washington, he served as Team Leader for NATO Policy in the State Department’s Office of European Political and Security Affairs, where he was responsible for NATO enlargement, NATO-Ukraine, and European Security and Defense policy issues.

Over the course of his career, Hardt has received multiple Senior Performance Awards, the Director General's Award for Reporting, five Superior Honor Awards, and three Meritorious Honor Awards. He also received the Chairman of the Joint Chiefs of Staff Joint Meritorious Civilian Service Award and the US Special Operations Command Distinguished Civilian Service Award. He earned a bachelor’s degree in history from Yale University and a master’s in law and diplomacy and a PhD from the Fletcher School of Law and Diplomacy at Tufts University.

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.