Biography
Dr Henning Tamm joined the School of International Relations in September 2016. Previously, he was a Postdoctoral Prize Research Fellow at Nuffield College, University of Oxford, and a Predoctoral Fellow with the Program on Order, Conflict, and Violence at Yale University鈥檚 MacMillan Center for International and Area Studies. He received his DPhil (PhD) and MPhil from the University of Oxford and his BA from the University of T眉bingen.
Teaching
Convenor
- Armed Conflict in Africa (IR3070)
- Rebels, Terrorists, Militias: The Comparative Analysis of Armed Groups (IR4563)
- International Security (IR5001)
Contributor
- Concepts in Global Politics (IR1005): lectures on War
- Foreign Policy and Diplomacy in Global Politics (IR1006): lectures on African Foreign Policies (Nigeria and Rwanda)
- Issues in International Relations (IR2006): lectures on Waging War
- Honours Dissertation (IR4099): lecture on Case Studies and Comparative Case Study Methods
Research areas
One of Dr Tamm's main research interests concerns state support for rebel groups. His on the Congo Wars argues that rulers in post鈥揅old War Africa often form alliances with rebel groups abroad to alleviate threats to their political survival at home. Going beyond this article in terms of both time period and theoretical focus, his ongoing book project, "Revolutionary Sponsors," investigates African revolutionary leaders and their support for rebel groups since independence. The research he conducted in the Democratic Republic of Congo (DRC), Rwanda, and Uganda also resulted in an on status competition and the direct interstate clashes between Rwanda and Uganda in the DRC.
Together with (ETH Z眉rich), he published several papers on mutual interventions, that is, rival states simultaneously intervening in each other鈥檚 intrastate conflicts by supporting rebel groups. Their develops this concept and introduces their data on Africa (1960鈥�2010). It conceptualizes mutual interventions as a distinct, indirect form of interstate conflict and shows that they are more common and last much longer than direct interstate conflicts in Africa. Using monthly data, their shows that mutual interveners鈥� perceptions of a bilateral crisis make them more likely to negotiate with each other. Their explains why some mutual interventions end in bilateral negotiated settlements whereas others end due to events in, or actions by, only one of the two states. In their contribution to an , they discuss why negotiated settlements of mutual interventions rarely lead to the resolution of the associated intrastate conflicts.
Dr Tamm's other major research interest is rebel group fragmentation. His develops a theory that explains how state sponsors foster either cohesion, fragmentation, or internal coups. It illustrates the theory with case studies of Sudanese and Lebanese insurgent groups. His elaborates on this theory and dissects how external troop support affected rebel fragmentation in the Second Congo War. While these articles primarily ask why some groups split whereas others remain cohesive, his project on 鈥淰arieties of Insurgent Fragmentation鈥� examines how groups split. The project received funding from the .
PhD supervision
- Sike Li
Selected publications
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Open access
Duursma, A. & Tamm, H., Aug 2025, In: Journal of Conflict Resolution. 69, 7鈥�8, p. 1205鈥�1231
Research output: Contribution to journal 鈥� Article 鈥� peer-review
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Open access
Tamm, H. & Duursma, A., Mar 2023, In: European Journal of International Relations. 29, 1, p. 3鈥�28
Research output: Contribution to journal 鈥� Article 鈥� peer-review
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Tamm, H. & Snidal, D., 28 Apr 2023, International organization and global governance. Weiss, T. G. & Wilkinson, R. (eds.). 3rd ed. Abingdon, Oxon: Routledge Taylor & Francis Group, p. 155-167
Research output: Chapter in Book/Report/Conference proceeding 鈥� Chapter
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Open access
Tamm, H., 2022, In: Journal of Strategic Studies. 45, 4, p. 637-664
Research output: Contribution to journal 鈥� Article 鈥� peer-review
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Open access
Karl茅n, N., Rauta, V., Salehyan, I., Mumford, A., San-Akca, B., Stark, A., Wyss, M., Moghadam, A., Duursma, A., Tamm, H., Jenne, E. K., Popovic, M., Siroky, D. S., Meier, V., Chinchilla, A., Rickard, K. & Spatafora, G., 1 Dec 2021, In: International Studies Review. 23, 4, p. 2048鈥�2078 31 p., viab053.
Research output: Contribution to journal 鈥� Article 鈥� peer-review
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Open access
Duursma, A. & Tamm, H., 1 Dec 2021, In: International Studies Quarterly. 65, 4, p. 1077鈥�1086 10 p., sqab023.
Research output: Contribution to journal 鈥� Article 鈥� peer-review
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Tamm, H., 2020, The governor鈥檚 dilemma: indirect governance beyond principals and agents. Abbott, K. W., Genschel, P., Snidal, D. & Zangl, B. (eds.). Oxford: Oxford University Press, p. 119鈥�136
Research output: Chapter in Book/Report/Conference proceeding 鈥� Chapter
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Open access
Tamm, H., Jul 2019, In: African Affairs. 118, 472, p. 509鈥�530
Research output: Contribution to journal 鈥� Article 鈥� peer-review
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Snidal, D. & Tamm, H., 2018, International Organization and Global Governance. Weiss, T. G. & Wilkinson, R. (eds.). 2nd ed. London: Routledge, p. 135-145
Research output: Chapter in Book/Report/Conference proceeding 鈥� Chapter
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Open access
Tamm, H., 1 Dec 2016, In: International Studies Quarterly. 60, 4, p. 599-610 12 p.
Research output: Contribution to journal 鈥� Article 鈥� peer-review