is Assistant professor at university of Ibraki,japan. He completed his Ph. D. in Applied Zoology at Hokkaido University, Japan in 1984  recently in 2003 he is awarded with The Japanese Society of Applied Entomology and Zoology Award.He also had postdoctoral fellow at University of Amsterdam.

My research is primarily concerned with the mechanism of speciation in spider mites (Acari) and herbivorous insects. I am specifically interested in the evolutionary processes leading to the utilization of different host plants by closely related mite species. To address such problems, biochemical markers (intra- and inter-specific variations in allozymes and DNA) are coupled with other studies (morphology, genetics, hybridization capabilities, ecology and life history). By adopting a multidisciplinary approach, a better understanding of the factors influencing rates of evolution is also expected to be achieved.