Kazuhiko Katō (加藤 和彦, Katō Kazuhiko; March 21, 1947 – October 17, 2009), nicknamed "Tonovan" (トノヴァン), was a Japanese record producer, songwriter and singer. He sometimes used the spelling of "Kazuhiko Katoh".
Source: “Kazuhiko Katō”, English Wikipedia (CC BY-SA 4.0), excerpt