He received both the M.D. and the Ph.D. degrees from Medical School of Osaka City University and Yokohama City University Graduate School of Medicine in 1996 and 2000, respectively. He held many positions such as Otolaryngologist at Yokohama City University (from 2000 to 2003), Visiting Scientist of Texas MD Anderson Cancer Center (2003-2004), Otolaryngologist at Keio University (since 2004), Reviewer of the Laryngoscope (since 2009), Reviewer of the American Chemical Society Nano (since 2011), Reviewer of the Indian Journal of Dental Research, and Editorial Board Member of Case Reports in Otolaryngology. He is mainly interested in basic and clinical head and neck cancer.