Hirofumi OGURI

Associate Professor of Keio University Law School

Hirofumi OGURI joined the faculty of Keio University Law School as associate professor in April 2025, after teaching since October 2020 as an assistant professor and, since April 2023 as an associate professor, at the Graduate School of Humanities and Social Sciences, Okayama University.

He graduated from Keio University with LL.B. in 2013 and with LL.M. in 2015, before completing his Ph.D. in Law at Kyushu University in 2018. He has been a visiting scholar at the Max Planck Institute for Comparative Public Law and International Law (2017, 2018, 2019-2020) and at the Faculty of Law, University of Vienna (2020-2021).

His research interests lie in the history of international law, with a particular focus on the development of European Law of Nations in the nineteenth century and its reception in East Asia, including Japan. He is also engaged with theoretical questions concerning the formation of international law.

At the Law School, he has taught International Law, History of International Law, International Security Law and Moot Court.

◆Fields of Expertise

• International Law
• European Legal and Constitutional History

◆Publications 　　　

• "Inseparable pairs for modernising Japan? Japanese Ministry of Foreign Affairs and academia, 1880-1914"; in Raphaël Cahen et al. (eds.), Relations internationales et droit(s): acteurs, institutions et législations comparées (1815-1914) (Pedone, 2024), 463-492.

• "Das Naturrechtsdenken in der Völkerrechtswissenschaft um 1800", Journal of Law and Politics (Kyushu University), vol.90, no.3 (2023), 167-188 [in Japanese].

• "War and International Legal Order: Historical Perspective", Online Law Journal (Yuhikaku), 2023 [in Japanese].

• "Zur Bedeutung der Theorie des "teutschen Völkerrechts" für die moderne Völkerrechtswissenschaft: in Bezug auf die Theorie des Staatenbundes in der Rheinbundzeit"; in Kinji AKASHI/Sang-hee HAN (eds.), Universalitas juris publici Europaei et historia mundi (Keio University Press, 2023), 179-222 [in Japanese].

• "The Genealogy of Consensualism in International Legal Scholarship (1)-(3): Lassa Oppenheim's Common Consent Theory Revisited", Okayama Law Journal, vol.71, no.1 (2021), 1-64; vol.71, no.2 (2021), 1-67; vol.72, no.2 (2022), 1-87 [in Japanese].

• "Taming Politics or Naïveté of Positivism in International Law?: Lassa Oppenheim and His Ascertainment of Customary International Law"; in Raphael Schäfer and Anne Peters (eds.), Politics and the Histories of International Law: The Quest for Knowledge and Justice (Brill, 2021), 455-478.

• "Conceptions of International Law in Tanaka Kotaro's Theory of World Law: Their Natural Law Basis and the Roles of General Principles of Law", Yearbook of World Law, no.39 (2020), 64-92 [in Japanese].

• "The Role of State Consent in International Lawmaking: The Decay of Consent?", Journal of Social Science (The University of Tokyo), vol.68, no.1 (2017), 61-95 [in Japanese].

• "Oppenheim's Theory on Customary International Law: Tacit Consent and Universality of International Law", Journal of Law and Politics (Kyushu University), vol.83, no.3 (2016), 269-295 [in Japanese].

On a detailed biography, please visit the following link:

https://www.k-ris.keio.ac.jp/html/100010843_en.html

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