Toshiyuki Kobayashi

is a Japanese mathematician known for his original work in the field of Lie theory, and in particular for the theory of discontinuous groups (lattice in Lie groups) and the application of geometric analysis to representation theory. He was a major developer in particular of the theory of discontinuous groups for non-Riemannian homogeneous spaces and the theory of discrete breaking symmetry in unitary representation theory.

He has been a member of the Science Council of Japan since 2006, Board of Trustees of the Mathematical Society of Japan (2003–2007), the Editor in Chief of the ''Journal of the Mathematical Society of Japan'' (2002–2006), and currently is the Managing Editor of the ''Japanese Journal of Mathematics'' since 2006. Provided by Wikipedia