Tetsuji Tokihiro has been a Professor at the Graduate School of Mathematical Sciences, the University of Tokyo, Japan since 1999. His research interests include applied mathematics, especially nonlinear integrable systems, ultradiscrete systems, and mathematical medicine. He received his PhD from the University of Tokyo in 1986. He worked as a postdoctoral fellow at the University of Pennsylvania, and a lecturer in the Department of Applied Physics at the University of Tokyo, prior to joining the Graduate School of Mathematical Sciences, the University of Tokyo.