1. Introduction: Explaining Leadership in the Eurozone1.1 The Argument1.2 The Evidence1.3 The Method1.4 The Plan of the Book 2. Conceptualizing Leadership: What It Is and Why It Matters2.1 The Basic Ingredients: Power, Common Goal and Strategies2.2 Leadership and Success2.3 Two Conceptions of Leadership2.4 Defining Political Leadership 3. Theorizing Leadership: Emergence and Impact3.1 A Rational Theory of Political Leadership3.2 The Emergence of Political Leadership3.3 The Impact of Political Leadership3.4 Implications for the Empirical Research 4. Analysing Leadership I: Germany in the Eurozone Crisis4.1 No Leadership: The First Financial Assistance to Greece4.2 Failed Leadership: The Super-Commissioner4.3 Successful Leadership: The Fiscal Compact 5. Analysing Leadership II: The EU Institutions in the Eurozone Crisis5.1 No Leadership: The European Commission and Eurobonds5.2 Failed Leadership: The European Parliament and Eurobonds5.3 Successful Leadership: The European Central Bank and Outright Monetary Transactions 6. Evaluating Leadership: The Hard Case of the Eurozone6.1 Comparative Results 6.2 Leadership in the Eurozone: An Overview Assessment 7. Conclusions.