Matthias is a Junior Professor of International Public Law and Financial Law at Goethe University Frankfurt. He is an affiliate of the Max Planck Institute for Comparative Public Law and International Law in Heidelberg, Germany; and of the Cluster of Excellence “Formation of Normative Orders” at Goethe University Frankfurt. He is interested in the distinction between public and private forms of authority, as well as in the authority exercised by International Financial Institutions and its impact on democracy. Publications include: ‘We Need to Cut Off the Head of the King: Past, Present, and Future Approaches to International Soft Law’, Leiden Journal of International Law 25, 335-368 (2012); ‘Sovereign Debt Restructurings as Exercises of International Public Authority: Towards a Decentralized Sovereign Insolvency Law’, inSovereign Financing and International Law, Carlos Espósito et al. (eds.). Oxford University Press 2013, 39-70 (with Armin von Bogdandy); ‘A Matter of Perspective. Global Governance and the Distinction between Public and Private Authority (and Not Law)’, Global Constitutionalism 4 (2015) 48-84.