Gensei has involved in a wide range of civil and criminal litigations, domestic affair cases, and bankruptcy cases as a lawyer. In particular, he focused on consumer issues such as investment damage relief and contract disputes, and was also active as a member of the Consumer Affairs Committee of the Japan Federation of Bar Associations. He also has extensive experience in conducting surveys and managing conferences on the operational results of laws and regulations as the secretariat of the Consumer Commission, Cabinet Office, Government of Japan.

• 2016 – 2018 Consumer Commission, Cabinet Office, Deputy Director
• 2007 – 2016 Kiuchi General Law Office, Associate (Member of Kyoto Bar Association)
• 2006 – 2007 The Legal Training and Research Institute of Japan, legal apprentices

• 2004 Kyoto University, Bachelor of Laws (LL.B.)

• asialaw 2025 Rankings, to Gensei Ohama, Senior Counsel:
  “When asking questions to Thai lawyers, he acted as intermediaries, allowing us to communicate without feeling any language barriers and proceed with our work efficiently.”

• “Summary of the Consumer Contract Act Specific Committee Report”, NBL (1105), 58-62, 2017-09-01 Commercial Legal Department
• “Learning about solicitation regulations around the world (Part 12) Do-Not-Knock systems in Australia and the United States”, National Consumer Affairs Center of Japan issue (46), 17-19, 2016-05 National Consumer Affairs Center of Japan
• “Learning about solicitation regulations around the world (Part 3) Do-Not-Call systems in Australia and India”, National Consumer Affairs Center of Japan issue (37), 15-17, 2015-08 National Consumer Affairs Center of Japan
• “Q&A Consumer Damage Relief Laws and Practices (17) Small and Medium Enterprise Lease Damage”, 現代消費者法 (18), 128-133, 2013-03　民事法研究会

Corporate and Commercial

• Assistance for Japanese companies in establishing businesses in Thailand.