Anthony Cox is a film producer and art promoter who was once married to Yoko Ono.
Cox met Yoko Ono in 1961, after he saw some of her art work in an anthology and located her in Tokyo. The couple married on November 28, 1962. The marriage was annulled on March 1, 1963, but they re-married on June 6 of that year. Their daughter, Kyoko Chan Cox, was born August 8, 1963. Cox became a full-time caregiver for Kyoko, while both he and Ono continued with their art, collaborating as conceptual artists.
The marriage fell apart some time after 1966, when Ono met John Lennon at an art show, and Cox and Ono divorced on February 2, 1969. After a legal battle, Ono was awarded permanent custody of Kyoko. However, in 1971 Cox, who had joined a religious group known as the Church of the Living Word or "The Walk" after his divorce from Ono, vanished with Kyoko in violation of the custody order. He left The Walk after a few years. In 1978, Cox and Kyoko stayed with the Jesus People USA commune in Chicago. He contacted Yoko Ono after the death of Lennon in 1980. Afterward, Yoko Ono agreed to no longer attempt to locate Kyoko. Kyoko eventually made contact with Ono in 1994.