Teimoc Jonston-Ono learned judo and other Oriental martial arts as a young boy and was a prodigy in judo competition. He received a black belt when he was only 16, and won the junior and senior divisions of the US junior championships in 1972, also winning the National High School title that year. Jonston-Ono was US Champion in 1976 and 1978, placing second in 1972 and 1981-82, and third in 1980, 1983, and 1987-88. He competed through 1990 when he stepped back to coach martial arts.
Jonston-Ono became head trainer at the US Olympic Training Center in Colorado Springs in 1990, and in 1992 moved back to New York to direct the Chelsea Piers Martials Arts program, also teaching and coaching at the New York Athletic Club and the 5 Points Academy in Chinatown. In 2004 Jonston-Ono returned to the mats, competing in masters competitions. He was World Masters Jiu-Jitsu Champion from 2003-09, and was World Judo Masters Champoin in 2008, winning silvers in that event in 2003 and 2006-07, and a bronze in 2005. He is a 7th Dan in Judo and a first-degree black belt.
|Games||Discipline (Sport) / Event||NOC / Team||Pos||Medal||As|
|1976 Summer Olympics||Judo||USA||Teimoc Jonston-Ono|
|Middleweight, Men (Olympic)||=13|