The group is comprised of the following eight members (in the order of the Japanese syllabary):

• Keigo Endo, M.D., Ph.D.
  President, Kyoto College of Medical Science
  Professor Emeritus, Gunma University
  Former President, Japan Radiological Society
  Former President, the Japanese Society of Nuclear Medicine
  
• Kenji Kamiya, M.D., Ph.D.
  Vice President, Fukushima Medical University
  Vice President (Reconstruction Support/Radiation Disaster Medicine), Hiroshima University
  Council Member, Science Council of Japan
  
• Kazunori Kodama, M.D., Ph.D.
  Chief Scientist, Radiation Effects Research Foundation
  Chairman, Japanese Expert Panel for the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR)
  Former President, Japan Epidemiological Association
  
• Kazuo Sakai, Ph.D.
  Former Director, Research Center for Radiation Protection, Research Center for Radiation Emergency Medicine and Center for Human Resources Development, National Institute of Radiological Sciences (NIRS)
  
• Yasuhito Sasaki, M.D., Ph.D.
  Former President, National Institute of Radiological Sciences (NIRS)
  Former Professor of Radiology, School of Medicine, the Universiry of Tokyo
  Former Member of Main Commission of International Commission on Radiological Protection (ICRP)
  Former Chairman, the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR)
  
• Shigenobu Nagataki, M.D., Ph.D.
  Professor Emeritus, Nagasaki University
  Former Chairman, Radiation Effects Research Foundation
  Honorary Chairman, International Association of Radiopathology
  President, Radiation Effects Association
  
• Kazuhiko Maekawa, M.D., Ph.D.
  Professor Emeritus, the University of Tokyo
  Chairman, the Council for Radiation Emergency Medicine Network, National Institute of Radiological Sciences (NIRS)
  Representative Director, the Japanese Association for Radiation Accident/ Disaster Medicine
  Special Disaster(Nuclear) Assitance Advisor, Tokyo Fire Department
  
• Shunichi Yamashita, M.D., Ph.D.
  Vice President, Fukushima Medical University
  Trustee and Vice President (Fukushima Reconstruction Support), Nagasaki University
  Council Member, Science Council of Japan

Upon the request of the Prime Minister's Office and whenever needed, the Nuclear Disaster Expert Group advises on the issues concerning the nuclear power plant crisis, providing their expertise as external specialists in radiation medicine, radiological protection and science. The main issues handled by the group include the following:

• Ensuring the safety of people who are forced to take shelter, evacuate or relocate.
• Long term medical care and health management of the affected people.
• Other general issues related to the health effects of radiation.

• Comments contributed to the Nuclear Disaster Expert Group by the Experts from Other Countries
• 10. Health Risks from the Accident of Fukushima Daiichi Nuclear Power Station: Present Situation and Challenges for the Future
  - Christian Streffer - (June 9, 2015)
• 9. Lessons for future generations
  - Rethy Kieth Chhem - (August 6, 2014)
• 8. Dear residents of the Fukushima Prefecture
  - Viktor Ivanov - (January 14, 2014)
• 7. Message to our friends affected by the nuclear component of the earthquake/tsunami event of March 2011
  - Werner Burkart - (December 27, 2013)
• 6. A note of support from Germany
  - Hajo Zeeb - (August 26, 2013)
• 5. Message to our friends affected by the nuclear component of the earthquake/tsunami event of March 2011
  - Werner Burkart - (August 26, 2013)
• 4. Dear residents of the Fukushima Prefecture
  - Mikhail Balonov - (August 9, 2013)
• 3. Message to the Japanese people
  - Geraldine Anne Thomas - (August 9, 2013)
• 2. Message to the People in Fukushima Prefecture as well as People in Japan about the Fukushima Nuclear Disaster
  - Abel J. Gonzalez - (July 30, 2013)
• 1. A Message to the Japanese People
  - Fred A. Mettler - (July 30, 2013)