- Ph.D. International Relations: Department of Political Science and the East Asian Institute of Columbia University, NYC, May 1995
- M.A. International Affairs: School of International Service, The American University, Washington, D.C., December 1986
- B.A. Philosophy: Department of Literature, Jochi (Sophia) University, Tokyo, Japan, March 1980
- B.A. Political Science and Economics: The College of Law, Nihon University, Tokyo, March 1977
- Professor: School of International Liberal Studies, Waseda University, Tokyo, since April 2007 to present
- Professor: SIPEB, Aoyama Gakuin University, Tokyo, April 2000
- Associate Professor: SIPEB, Aoyama Gakuin University, Tokyo, April 1998
- Lecturer: Faculty of Urban Science, Meijo University, Nagoya, October 1995-February 1998
- Postdoctoral Fellow: Edwin O. Reischauer Institute of Japanese Studies, Harvard University, September 1994-July 1995
- Hiroshi Ohta (2016) Kankyo-to-enerugee-wo meguru shuyoukoku-no hikakuseiji: Jizokukanou shakai heno sentaku (Comparative Politics about the Environmental and Energy Policies of Major States: Make a Choice for A Sustainable Society), Tokyo: Toshindo: 536pp.
- H. Ohta (2016) “Global Governance and China: The Hu Jintao Era and Governance of International Public Goods,” The Japan Institute of International Affairs (JIIA), Japan Digital Library International Circumstances in the Asia-Pacific Series: China and Korean Peninsula, JIIA, March.
- H. Ohta and Yves Tiberghien (2015) “Saving the Kyoto Protocol: What Can We Learn from the Experience of Japan-EU Cooperation?” P. Bacon, H. Mayer, and H. Nakamura, eds., The European Union and Japan: A New Chapter in Civilian Power Cooperation? Surrey, UK: Ashgat: 169-184.
- H. Ohta (2014) “Climate Change and Human Security: the Convergence on Policy Requirements” in S. Takahashi ed., Human Rights, Human Security, and State Security: the Intersection, Oxford: Praeger: 75-96.
- H. Ohta (2012) “The Arctic and Japan: Energy Security and Climate Change” in Hooman Peimani, ed., Energy Security and Geopolitics in the Arctic: Challenges and Opportunities in the 21st Century, New Jersey: World Scientific: 193-223.
- H. Ohta (2010) “Japanese Climate Change Policy: Moving beyond the Kyoto Process” in Hans G. Brauch et al., Coping with Global Environmental Change, Disasters and Security: Threats, Challenges, Vulnerabilities and Risks, Berlin: Springer: 1381-1391.
Recent Research Grants
- 2016 (July1) – 2019 (March 31): Research grant from the Japan Society for the Promotion of Science (JSPS) “In Search of the Solutions of Global Issues through the Ideal and Normative Evaluation of Globalization”
- 2011(April 1) – 2016 (March 31): Research grant from the JSPS for the research on “Fishery Resources Management as a Regime Complex: Decision-making Factors and Effectiveness Analysis”
Recent Social Activities
- 2016 (June) – 2018 (May): The Auditor of the Japan Association of International Relations
- 2014 (June) – 2016 (May): The Auditor of the Japan Association of International Relations
- 2011(October) – 2012 (October): The member of the Executive Board of Japan Association of the United Nations Studies