Director of Research

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Dr. Tim Sweijs is the Director of Research at The Hague Centre for Strategic Studies and a Senior Research Fellow at the War Studies Research Centre of the Netherlands Defence Academy. His work is multidisciplinary in nature and straddles political science, strategic studies and war studies.

He is a board member at the European Initiative for Security Studies where he chairs the War, Coercion and Statecraft Working Group. He is also a Research Affiliate at the Center for International Strategy, Technology and Policy in the Sam Nunn School of International Affairs at the Georgia Institute for Technology. Tim has advised international organisations, governments and defence departments across the globe. He has provided expert testimony to the United Nations Security Council, the European Parliament, the Dutch Parliament, as well as to NATO’s Parliamentary Assembly. He teaches an advanced graduate and executive staff command course on the future of war.

Tim holds degrees in War Studies (PhD, MA), International Relations (Msc) and Philosophy (BA) from King’s College, London and the University of Amsterdam.

His most recent book is on state threat behaviour and interstate crisis escalation over the past century titled The Use and Utility of Ultimata in Coercive Diplomacy (Palgrave Macmillan, 2023). Visit the book’s website at

His forthcoming volume – co-edited with Jeffrey Michaels – titled Beyond Ukraine: Debating the Future of War will be published by Hurst in March 2024.

Key fields of interest: state behaviour and international system stability, war and warfare (past, present, future), coercion, deterrence, strategy, defence planning, emerging technologies, early warning, analytical methods and techniques.

Recent publications

The Conduct of War in the 21st Century. Kinetic, Connected and Synthetic, w / R Johnson & M Kitzen,  Routledge Advances in Defence Studies (2021).

Assessing Change and Continuity in the Character of War, w / R Johnson & M Kitzen, Routledge Advances in Defence Studies (2021) (open access)

Deterrence in the 21st Century—Insights from Theory and Practice, w / F Osinga, Asser-Springer (2021). (open access)

The Essence of Cross-Domain Deterrence. w / Samuel Zilincik, Asser-Springer (2021). (open access)