In 1968 Nobuhiro Kawanaka co-founded the Japan Filmmakers Cooperative, a national distributor for independent and experimental films, and later played a key role in experimental film in Japan as a founding member of Underground Center and Image Forum. He was also a key member of Video Hiroba, which was founded in 1972. He was the original edotor of the film magazine Monthly Image Forum. He created the Video Letter Exchanges series (1979-) in collaboration with Sakumi Hagiwara, among other works.