Hisako Yakumi

She is a member of Academy City Board of Directors who specializes in the medical field and the head of the Agitate Halation Project as well as many medical related researches. She has profound influence in the medical field. Her real age is over 70; however, her bones and organs are healthier than Tsuchimikado's because of special anti-aging treatments she has been using. (Source: Toaru Majutsu no Index Wiki)