Research

Professor Mueller’s research covers several areas of German and European public law, with a particular interest in economic and financial regulation, and in the historical and philosophical foundations of law. His work provides a constitutional analysis of financial and regulatory governance under conditions of crisis and structural transformation. From this perspective, his doctoral thesis suggests principles for balancing investors‘ rights and public interests during financial crises („Finanzmarktstabilisierung und Anlegereigentum“, 2019), his habilitation thesis develops a constitutional framework for conditionality as a governance tool („Konditionalität“, forthcoming 2026). His current research builds on these books and studies the effects of financial governance on autonomy, equality, and democracy, as well as further forms of non-imperative governance (in particular governance through information, risk, and uncertainty). An edited volume on these questions has been published with Springer in 2024. With regard to legal philosophy, Mueller is particularly interested in the development of legal structures and principles over time, and the relationship of time and democratic law-making. His 2022 book on lessons from a Hegelian theory of codification for law-making processes at EU level („Zeit in Gesetzen erfasst“) was recognized as one of the „legal books of the year“ by German Juristenzeitung and as an important contribution to continental philosophy by „The man of letters“ in China.

1. Konditionalität. Zu einer Form nicht-imperativer Verhaltenssteuerung durch öffentliche Finanzen im deutschen und europäischen Recht [Conditionality. On a Form of Non-Imperative Governance through Public Finances in German and European Law], forthcoming 2026

2. Finanzmarktstabilisierung und Anlegereigentum. Ansätze zu einer verfassungsvergleichenden Prinzipienbildung für den hoheitlichen Umgang mit Finanzkrisen [Financial Market Stabilisation and Investors‘ Property Rights. Approaches to a Comparative Constitutional Development of Principles for the Sovereign Handling of Financial Crises], 2019

3. (co-edited with Hannes Beyerbach): European Platform Regulation. Foundations and Perspectives, forthcoming 2026.

4. Europäische Finanzsouveränität [European Financial Sovereignty], in: Till Patrick Holterhus/Ferdinand Weber (eds), Handbuch Europäische Souveränität [Handbook of European Sovereignty], 2024, S. 221 – 246.

5. Legislation, Fast and Slow – Verfassungsrechtliche Direktiven für die zeitliche Gestaltung von Gesetzgebungsverfahren [Legislation, Fast and Slow – Constitutional Directives for the Temporal Design of Legislative Procedures], AöR 2025, S. 554 – 594

6. International Financial Institutions in Investment Law and Arbitration, in: Christian J. Tams et al. (eds.), International Investment Law and the Global Financial Architecture, 2017, pp. 316 – 348.

7. Creditor Protection Against Bank Bail-Ins – A Case for International Investment Arbitration?, Capital Markets Law Journal 10 (2015), pp. 276 – 294

8.(with Ann-Katrin Kaufhold): Öffentliches und Privates Geld- und Finanzmarktrecht [Public and Private Law of Money and Financial Markets], in: Wolfgang Kahl/Markus Ludwigs (eds), Handbuch des Verwaltungsrechts [Handbook of Administrative Law], Band VI, 2024, S. 901 – 947