January 2016-December 2018 A Member of Policy Council
April 2006-March 2008 Liaison of Japan Chapter
Japan Chapter of System Dynamics Society
April 2016-March 2020 Vice President
April 2010-March 2016 A Member of Board
April 2006-March 2008 A Member of Board
Japan Society of Business Mathematics
June 2023- Director
June 2017-May 2020 Director
June 2005-May 2009 Director
June 2001-May 2003 Controller
June 1997-May 2001 Secretary