Shunsaku Nii received his degree of Doctor of Science from the Department of Mathematics of the Graduate School of Science at Kyoto University in March of 1995 under the direction of Hiroshi Kokubu. From 1994 to 1996 he was a Research Fellow of the Japan Society for Promotion of Science. From 1996 to 2002 he was a Research Associate at the Department of Mathematics of the Faculty of Science at Saitama University. During that period, from 1997 to 1999, he was a Visiting Researcher of the Division of Applied Mathematics at Brown University. He has held a position of Associate Professor of the Faculty of Mathematics at Kyushu University since 2002. From 2013 to 2014, he was a Visiting Researcher of Le Centre de Physique Théorique at Aix-Marseille Université.