He obtained Ph.D. from Graduate School of Science, Kyoto University, Kyoto, Japan in 2001. His research field is in vertebrate paleontology, particularly on Cenozoic mammalian fossils from Myanmar and Mongolia, mammalian evolution in the Paleogene of Asia, Mesozoic mammalian fossils from Japan, vertebrate fossils from Mesozoic and Cenozoic of Mongolia, and Miocene mammalian fossils from Kenya.