Google Scholar Citations


(2007) Learning in Modern International Society, Wiesbaden: VS Verlag.

(2007) with Jörn Grävingholt and Stephan Klingebiel, Development Cooperation and Non-State Armed Groups, Bonn: German Development Institute (DIE) (Studies 29).

(2007) with Jörn Grävingholt and Stephan Klingebiel, Entwicklungszusammenarbeit im Umgang mit nichtstaatlichen Gewaltakteuren (Development Cooperation and Non-State Armed Groups), Bonn: German Development Institute (DIE) (Studies 24) (in German).

Policy Papers

(2020) Linking Official and Unofficial Approaches of Engaging Armed Actors, in: RESOLVE Network, 12 June 2020.

(2016) “Engaging Armed Actors in Conflict Mediation. Consolidating Government and Non-government Approaches”, in: Humanitarian Engagement with Non-state Armed Groups, pp. 23-37, London: Chatham House.

(2014) Local Marijuana Legalization in U.S., Mexico May Impact Hemisphere-Wide Policy, in: World Politics Review, 7 March 2014.

(2013) with Virginia Comolli, Drug Markets, Security and Foreign Aid, Report 6, Modernising Drug Law Enforcement, London: International Drug Policy Consortium (IDPC) / Royal Institute of International Affairs, Chatham House / International Institute for Strategic Studies (IISS).

(2013) with Benoît Gomis, “Uruguay Marijuana Bill Portends New Era in Drug Policy”, in: World Politics Review, 20 August 2013.

(2013) Gamechanging Report on Drugs in the Americas, Expert Comment on the OAS Report on the Drug Problem in the Americas, London: Royal Institute of International Affairs, Chatham House.

(2012) Reasoning with Rebels. International NGOs’ Approaches to Engaging Armed Groups, SWP Research Paper 11, Berlin: German Institute for International and Security Affairs (SWP).

(2011) with Jörn Grävingholt, “Engaging Armed Groups in Development Cooperation”, in: Digital Development Debates, Vol. 5 (online).

(2011) with Ulrich Schneckener, NGOs and Nonstate Armed Actors. Improving Compliance with International Norms, USIP Special Report 284, Washington: United States Institute of Peace (USIP).

(2011) Peace Negotiations in the Philippines: The Government, the MILF and International NGOs, USIP Peace Brief 91, Washington: United States Institute of Peace (USIP).

(2008) “Das Problem der Sicherheit für NGOs in Afghanistan“ (The Security Problem for NGOs in Afghanistan), in: Peter Schmidt (ed.), Das internationale Engagement in Afghanistan. Strategien, Perspektiven, Konsequenzen (The International Engagement in Afghanistan. Strategies, Perspectives, Consequences), SWP-Studie S 23, Berlin: German Institute for International and Security Affairs (SWP), pp. 49-55 (in German).

(2004) Engaging Non-State Armed Groups in Humanitarian Action. State Actor and Non-Governmental Approaches, DIE Background Paper, Bonn: German Development Institute (DIE).

Academic Journals (peer-reviewed)

(in manuscript) with Judith Vorrath, “The Effects of Exile Rebel Leadership in Armed Conflicts”

(2016) with Carolin Goerzig, “The Hurting Way Out: Group Cohesion and the Mitigating Potential of Private Actors in Conflict Negotiation”, in: Max Planck Institute for Social Anthropology Working Papers, No. 177.

(2016) with Carolin Goerzig, “Influencing Negotiation Willingness in the Middle East: The Potential Contributions of Private Actors”, in: Negotiation Journal 32 (2): 151-163.

(2011) with Ulrich Schneckener, “Engaging Non-State Armed Actors. Options and Strategies”, in: International Review of the Red Cross 93 (883): 1-19.

(2011) with Ulrich Schneckener, “How to Engage Armed Groups? Reviewing Options and Strategies for Third Parties”, in: S+F Sicherheit und Frieden [Security and Peace] 29 (4): 254-259.

(2010) with Ulrich Schneckener, “Verhaltensänderung durch Normdiffusion? Die Ansätze von IKRK und Geneva Call im Umgang mit bewaffneten Gruppen” (Behavioural Change through Norm Diffusion? The Approaches of ICRC and Geneva Call Engaging Armed Groups), in: Die Friedens-Warte – Journal of International Peace and Organization 85 (4): 29-54 (in German).

(2006) “Engaging Non-State Armed Groups in Humanitarian Action”, in: International Peacekeeping 13 (3): 396-409.

(2004) “’A Grain of Truth’ – An Appraisal of the TRC’s Contribution to the Process of National Reconciliation in South Africa”, in: BSIS Journal of International Studies, Vol. 1 (online).

Book Chapters

(2015) with Carolin Goerzig, “The Dark Side of Recognition. Mutual Exclusiveness of Passive and Active Recognition in the Middle East Conflict”, in: Christopher Daase, Caroline Fehl, Anna Geis, and Georgios Kolliarakis (eds.), Recognition in International Relations, Houndmills: Palgrave Macmillan.

(2015) with Ulrich Schneckener, “The Power of Persuasion. The Role of INGOs in Engaging Armed Groups”, in: Heike Krieger (ed.), Inducing Compliance with International Humanitarian Law, Cambridge: Cambridge University Press.

(2015) “NGOs as norm dealers: Norm-Diffusion in Conflict Management using the example of the ICRC”, in: Felix Dane (ed.), International Security. A European-South American Dialogue, Rio de Janeiro: Konrad-Adenauer-Stiftung.


(2014) “Is arming opposition groups really the answer?”, in: Politics Reconsidered, Politics and International Studies (PAIS), University of Warwick.

(2012) “Reasoning with Rebels: the Nitty-Gritty of Engaging Armed Groups”, in: Program on Humanitarian Policy and Conflict Research (HPCR), Harvard University.

(2012) “Taliban Talks: Not the Solution to Afghanistan’s Problems”, in: Kings of War, Department of War Studies, King’s College London.

Reviews and Conference Reports

(2011) Review of “Hans-Georg Ehrhart / Martin Kahl ( Hrsg.) (2010). Security Governance in und für Europa. Konzepte, Akteure, Missionen”, in: Zeitschrift für Außen- und Sicherheitspolitik (Journal for Foreign and Security Policy) 4: 771–773 (in German).

(2007) with Anna-Christine Janke and Wolfgang Armbruster (eds.), Krisenpräventive Wirkungen der entwicklungspolitischen Zusammenarbeit mit Zentralasien (Crisis Preventive Effects of Development Cooperation with Central Asia), BMZ Spezial 143, Bonn: Federal Ministry for Economic Cooperation and Development (BMZ) (in German).