 After he graduated from Keio University, he continued his training in aikido, while working in the family business.In 1967 he delegated his responsibilities in the family business so that he could become a full time professional aikido instructor and he became an uchi deshi of Aikido Founder Morihei Ueshiba who awarded him the rank of 6th Dan in aikido.In 1972 Maruyama resigned from the Aikikai to become the chief instructor of the Ki No Kenkyukai which had been founded the previous year, at which time he was granted the rank of 8th Dan by Koichi Tohei.