European leaders have struggled to find common responses to the polycrisis the EU is facing. This crisis of leadership makes it urgent that scholars provide a better understanding of the role and impact of leadership in EU politics and policy making. This article prepares the ground for a collection of contributions that addresses this need by strengthening old and building new bridges between the academic domains of European studies and leadership studies. It opens with a discussion of the contested concept of leadership in the context of the European polity and politics, challenging the conventional view that leadership is necessarily a matter of hierarchy. Moreover, it argues that rather than leaderless, the EU is an intensely 'leaderful' polity. Subsequently, this introduction identifies four key debates in contemporary EU leadership research and discusses the value and insights the contributions in this special issue bring to these debates.

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Collaborative leadership has stood at the heart of European politics since its inception. Yet EU scholars have only recently started to examine the concept and mainly from an institutional perspective. This article conceptualises the phenomenon of collaborative leadership from an actor-centered perspective. It explores a central condition for successful collaborative leadership identified in the literature: the existence of shared beliefs among the leaders involved. To do this, the article focuses on four events in the history of European Economic and Monetary Union. Using the method of cognitive mapping, the study establishes the extent of congruence in the beliefs on European integration and fiscal and monetary policy of the four leadership trios overseeing these events. On the basis of a survey of leading experts in the field, the article reveals that the level of cognitive proximity in leaders' beliefs aligns with the perceived success with which the trios exerted collaborative leadership.

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Cognitive complexity is a concept that allows scholars to distinguish unidimensional thinking from multidimensional thinking, which allows citizens to identify and integrate various perspectives of a topic. Especially in times of fake news, fact-free politics, and affective polarization, the news media would ideally foster such complex political understanding. The current paper introduces the method of cognitive mapping to measure cognitive complexity regarding citizens’ understanding of the financial crisis, one of the most pressing political issues of the past decades. Linking content-analytic data to panel-survey data, we examine how exposure to news about the crisis relates to cognitive complexity. A wide variety of news sources (print, television, and online) were analyzed to take the high-choice media environment into account. Results show that news consumption generally is related to a less cognitively complex understanding of the financial crisis. However, actual exposure to news about the crisis (combined measurement of content analysis and survey data) is positively related to cognitive complexity, particularly among less-educated citizens. In addition, the most prominent topics in news coverage were more frequently associated with the financial crisis, as reflected in the cognitive maps of less-educated citizens exposed to more crisis news. These findings demonstrate the potential of news media to increase citizens’ complexity of understanding, especially among the less educated.