2014年から2015年、APEC Project Overseer and Moderator (APEC Project: Workshop on the Climate Impact on the Oceans and Fisheries Resources)。2013年、Advisor, Representative of the Government of Japan, International Court of Justice (ICJ), the case concerning Whaling in the Antarctic (Australia v. Japan)。2012年、ミナミマグロ保存国際委員会議長。2003年から2005年、Regional Cooperation Agreement on Combating Piracy and Armed Robbery against Ships in Asia (ReCAAP)協定の交渉議長。1989年から1990年、日本学術振興会特別研究員。
2017年、日中韓三国協力事務局次長離任の際に、Plaque of Appreciation, presented by Kang Kyng-wha, Minister of Foreign Affairs, Republic of Korea, August 25, 2017, No. 12336.を授与。
著作
主な執筆は以下のとおり。
UMEZAWA Akima, 2003, Prevention of crimes: by whom and how?, Proceedings of the 2003 international symposium : Unity in Diversity : Asian perspectives on international law in the 21st century, Oct. 11-12, 2003, Nagoya University, Japan, Japanese Society of International Law and Nagoya University's Research Project on the "Legal Technical Assistance in Asia"; co-editors of the proceedings: Saburi Haruo, Obata Kaoru, Kuong Teilee
UMEZAWA Akima, 2004, International order of maritime laws, Legal arrangement for the prevention and suppression of piracy in Asia, The Journal of international law and diplomacy, 103 (1), p107-125.
UMEZAWA Akima, 2004, Current stream of international maritime environmental affairs- National challenge after 10 years since the entry into force of the United Nations Convention on the Law of the Sea, Ocean Policy Research Foundation Newsletter, No.95 (Special Edition: Marine Day - Reflections on Japan as an oceanic country), p6-7.
UMEZAWA Akima, 2005, Enactment 10 years of the Law of the Sea in UN Convention “The challenge of the country to the treaty”, Hito to Kaiyo no Kyosei o Mezashite 150nin no Opinion 2 Heisei 17nen, p34-35.
UMEZAWA Akima, 2005, International prospects over preparation of submission to the Commission on the Limits of the Continental Shelf, Trends in the Science (Japan Science Support Foundation), p26-31.
UMEZAWA Akima, ed., 2015, APEC Workshop on the Climate Change Impact on Oceans and Fisheries Resources, APEC Publication (APEC 215-OF-04.1.), ISBN978-981-09-6516-7.