The unifying theme in my research is an interest in how context and dispositions (especially political values and identities) interact in shaping political attitudes and behavior. I have pursued this interest in the following fields.

The secEUrity Project  Home

In collaboration with a large group of European scholarschristian-wiediger-735834-unsplash I currently conduct a research project titled “Fighting together, moving apart? European common defense and shared security in an age of Brexit and Trump.” The project studies the dynamic relationship between elites and masses in policy-making about common defense in the multi-level European system and is generously funded by the Volkswagen Stiftung. You can visit the project’s website ( for more information.

Two overarching questions lie at the heart of the project: what and how do elites and European mass publics think about greater (European) defense, security, and military integration? More specifically, the project wants to achieve the following objectives: (1) study what mass publics and security elites understand by “common defense”, (2) estimate the level of public support or opposition to a vast array of possible forms of defense integration across Europe (first results see here), including assessing support for some form of European military, (3) explore differences in citizen perceptions and preferences across regions within the EU, (4) identify individual-level values, predispositions, attitudes, and demographic factors that shape support or opposition to defense integration, (5) examine how elite cues, social cues, and real-world events affect defense integration attitudes, (6) analyze the interplay of media content, individual media exposure, and mass opinion toward European defense and security integration, and (7) evaluate how (and how accurately) elites perceive mass opinion towards European defense and security integration, and vice versa. The project combines qualitative (elite interviews) and quantitative research (surveys with embedded experiments and media content analysis) to examine what factors affect European security policy preferences. The primary focus lies on France, Germany, Italy, and Great Britain, four countries that will play important roles in European defense integration.

The other team members are Filip Ejdus (University of Belgrade), Konstantin Gavras (MZES), Martial Foucault (Sciences Po Paris), Catherine Hoeffler (Sciences Po Bordeaux), Stephanie Hofmann (Graduate Institute-Geneva), Pierangelo Isernia (Università di Siena), Jean Joana (Université de Montpellier), Theresa Kuhn (University of Amsterdam), Moritz Neubert (MZES), Bogdan Radu (Babes-Bolyai University), Jason Reifler (University of Exeter), Harald Schoen (Universität Mannheim), Thomas Scotto (University of Strathcylde) Seiki Tanaka (University of Leeds), and Catarina Thomson (University of Exeter).

Popular conceptions of national identity: Content, variation, and political implications

Photo by Joshua Fuller on UnsplashIn an era of international economic exchange and mass migration, national boundaries
become both permeable and contested. Processes of international cooperation and migration cross and highlight national borders and have the potential to invoke national identities as a force that drives citizens’ opinion formation toward a wide range of issues. These identities come in different forms—there is variation between individuals and across time and space—and have distinct effects on political attitudes and behavior. At the same time, they depend on individual characteristics and contextual features, such as the national discourses about national identity. I have pulished several papers on these issues. They analyze, e.g., stability and change of different forms of German national identity (here), their effects on foreign policy attitudes (here), how they are related to general ideological and partisan preferences (here), and whether mixed conceptions of national identity can trigger ambivalence toward immigration (here). Current joint work with Maria Pesthy and Harald Schoen is conerned with the implications of national identity conceptions on voting behaviour in Germany (here). We study the differential effects of ethnocultural and civic dimensions of national identity on turnout and party preferences in Germany both before and after the peak of the so-called refugee crisis in 2015.

To explore these issues in a comparative perspective, Harald Schoen and I are preparing a grant proposal for a comparative research project. The Mannheimer Zentrum für Europäische Sozialforschung (MZES) already provides generous support. You can find more information about the project and preliminary work at our–somewhat dated–MZES project website.

Electoral choice

Photo by Arnaud Jaegers on UnsplashElectoral choice is the result of a complex interplay of party behavior and positions, political discourse about them, and voters’ predispositions. My work in this field has considered the relevance of a range of such predispositions for vote choice in different contexts, including the relevance of political values (here), ideological attachments (here), and national identities (see above). In a recent article on the effects of immigration attitudes on vote choice (here), Harald Schoen and I show how German citizens responded to party behaviour by changing partisan preferences on the basis of prior immigration attitudes in the context of the so-called refugee crisis in 2015. This event may thus have been a critical juncture transforming party competition in Germany. As such, the crisis represents a striking example of how events may focus attention on a new policy dimension and catalyse the evolution of new cleavages.

Foreign policy attitudes

Photo by Duangphorn Wiriya on Unsplash

Most of my work in this field is about the effect of general postures on attitudes toward specific policies. My book on this topic, Öffentliche Meinung zu Auslandseinsätzen der Bundeswehr [German Public Opinion on Bundeswehr Deployments Abroad], was published in 2017 by Springer VS. It shows how information context and general postures toward war and transatlantic cooperation interact in shaping German public attitudes toward specific military missions. I am also a co-author of the book Old Friends in Troubled Water, published by Nomos in 2016. The book analyzes American and German citizens’ responses to changes in the international system in the post-Cold War era and reveals transatlantic disagreement over core foreign policy postures, particularly the use of military force. Whether such cultural differences seriously strains the transatlantic relations, however, is conditional on elite behavior.

My research on foreign policy attitudes has also appeared in a number of journals, including the Review of International Political Economy (here), Journal of Conflict Resolution (here), The European Journal of Political Research (here), and the International Journal of Public Opinion Research (here).

Cross-cultural comparability of survey measures

Photo by Brendan Church on UnsplashSocial scientists are increasingly concerned whether the measures of their concepts are cross-culturally equivalent, i.e. whether they measure the same phenomena in the same way in different cultural settings. A straightforward comparison of the phenomena of interest—and their causes and consequences—is only possible if such equivalent measures exist. In the case of survey research, respondents may react differently to a given stimulus because they have different cultural backgrounds and therefore interpret the stimulus differently. My interest focuses on statistical approaches to assess whether cross-cultural equivalence is given in the case of measurement instruments that are  intended to measure core concepts that I frequently work with (for an application in the realm of national identity see here). Can the responses to items intended to measure political values and identities be modelled in a cross-culturally equivalent way? This is a difficult and largely unanswered question.

Intra-party politics

Photo by Ferran Feixas on UnsplashQuantitative research on party politics often assumes that parties are unitary actors. While it may be unproblematic to use this assumption in some circumstances, it limits our understanding in others. It implies, for example, that parties occupy precisely defined positions in the policy space, when in reality they are unlikely to be completely united in their preferences. If we conceptualize parties as organizations that consist of multiple actors, we can think of policy “positions” as distributions that might vary between parties, within parties between issues, and across time. The extent of this intra-party preference heterogeneity is an important variable to understand phenomena such as party strategy and competition, coalition building, and voting behavior. Nils D. Steiner and I study this heterogeneity using survey data from polls of party elites. Two papers have been published in this project, presenting the general approach and effects of preference heterogeneity on issue salience (here) and analyzing the degree to which preference homogeneity increases with the level of party institutionalization (here).

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