Masatoshi Koide graduated from Tokyo University in 1984 and from Cornell Law School in 1989. He originally joined Aflac in November 1998 and stayed with Aflac until March 2006. He worked for Nikko Asset Management before he joined Aflac again in December 2008 as vice president. He was promoted to senior vice president in January 2012 and to first senior vice president in July 2013. He assumed his current position in January 2015. He is a member of the New York State Bar.