Dr. Koido graduated from Saitama Medical University in 1984. After serving as a lecturer and medical director at the Advanced Emergency and Critical Care Center of Nippon Medical School Hospital in 1997, became the director of the clinical research department of the National Hospital Organization Disaster Medical Center (DMC) in 2008. In 2009, appointed as the director of the critical care center of the DMC, and in 2010, appointed as the secretary general of the DMAT Secretariat, Ministry of Health, Labor and Welfare of Japan. Currently, the Secretary-General of the DMAT of the National Hospital Organization Headquarters since April 2020.