Yoshimitsu Yamada Koichi Tohei Jon Mamoru Takagi (高木, July 2, 1942 – February 5, 1984) was a pioneer of aikido in the United States.

A second-generation American of Japanese descent born in Hawaii, Takagi's career was unexpectedly cut short when he was killed by a drunk driver.

Jon Takagi was born in Honolulu, Hawaii to first generation Japanese immigrants from Fukushima Prefecture, Japan.

[3] With the support of Isao Takahashi and Chester Sasaki, Takagi founded Arizona Aikikai on First Street in downtown Phoenix.

Takagi was also a frequent instructor at aikido dojos in Tucson and Flagstaff, Arizona, and at seminars throughout the western United States.