He received his Ph.D. in Mathematics from Hiroshima University in 2014. His major research areas are submanifold theory in symmetric spaces. Especially he has been studying homogeneous submanifolds in Riemannian symmetric spaces of noncompact type. His major papers are as follows; Kubo, A., Tamaru, H.: A sufficient condition for congruency of orbits of Lie groups and some applications, Geom. Dedicata 167 (2013), no.1, 233--238; Kubo, A.: Geometry of homogeneous polar foliations of complex hyperbolic spaces, Hiroshima Math. J. 45 (2015), no.1, 109--123; Hashinaga, T., Kubo, A., Tamaru, H.: Homogeneous Ricci soliton hypersurfaces in the complex hyperbolic spaces, Tohoku Math. J., to appear.