Education
From 1965 until his death he completed at least 37 short subject films in a wide variety of mediums, eight of which have been awarded the Ōfuji Noburō Award at the Mainichi Film Awards (more than any other director in the history of the prize) and his films have altogether earned at least 24 other awards internationally.
Career
His work is also the subject a two-hour-long documentary The Magic Ballet, released in 1990, and in 2003 four of his films placed in a list of the best 150 animated films and series as voted for by practitioners and critics of animation from around the world in a survey commissioned by Tokyo"s Laputa Animation Festival: most notably with The Magic Fox (おこんじょうるり, Okon Jōruri, literally "The Ballad Drama of Okon", 1982), which came twenty-eighth. After working at MOM Productions, known for its stop motion work for Rankin/Bass, he founded his own production company, Echo Incorporated, in 1964, and soon after made a trip to visit Czechoslovakian animator and director Břetislav Pojar. One of his last films, "Metropolitan Museum" (メトロポリタンミュージアム, Metoroporitanmyūjiamu, 1984), was commissioned and broadcast across the nation by Nippon Hōsō Kyōkai, the national public broadcasting organization of Japan, as one of their Minna no Uta interstitial programs.
He died during the production of The Restaurant of Many Orders (注文の多い料理店, Chūmon no Ōi Ryōriten, also known as "A Well-ordered Restaurant"), an adaptation of the Kenji Miyazawa story of the same name for which he enlisted the talents of Reiko Okuyama, a former Tōei Dōga animator and animation director who had for many years abandoned animation in favour of illustration, including copperplate engraving, to aid in realising the engraving-inspired visual style envisioned for the film.
A selection of Okamoto"s films was released on Laserdisc on August 24, 1986 and re-released on September 25, 1994. A more complete collection is to be released across three Digital Video Disc-Video discs on June 24, 2009: these will be available separately or as a box set, exclusive to which will be a fourth disc of additional materials such as university and advertising work.