 Baron was the eleventh head of the Mitsui family.After losing control of Mitsui companies after the dissolution of the "zaibatsu" following World War II, he ran Wakabakai Kindergarten, a kindergarten that was created by his father Takamine during his lifetime.Also, Takakimi's residence, the (built in 1952), was relocated from Nishi-Azabu, Minato, Tokyo to the Edo-Tokyo Open Air Architectural Museum in Koganei, Tokyo in 1996, and is now open to the public.