He is one of the prominent young researchers in the information technology field in Japan. He wrote more than 80+ journal papers and 150+ international conference papers. He received the Japanese Society for Artificial Intelligence (JSAI) Best Paper Award in 2002, JSAI Anniversary Project Award in 2006, and Information Processing Society of Japan (IPSJ) Nagao Special Researcher Award in 2008. He joined the editorial committee of JSAI since 2004, served as editor-in-chief in 2012-2014. He got Japan Society for the Promotion of Science (JSPS) Postdoctoral Fellowships for Research Abroad in 2005 and stayed for two years at Center for the Study of Language and Information (CSLI), Stanford University. After coming back to Japan, he joined the faculty of the University of Tokyo in 2007.