Career
Rosen is known for having directed the animated film adaptations of Watership Down (1978) and The Plague Dogs (1982), both from the Richard Adams novels. Rosen was originally the producer of Watership Down but took over as director after John Hubley fell back and died, he also wrote the screenplay for it. This was the first of two novels by Richard Adams he adapted.
In 1982 he also produced, directed and wrote the screenplay for another animated feature based on an Adams novel, The Plague Dogs (1982). His last film as director was Stacking (1987). His last project as producer was the animated Watership Down TV series in 1999.
Rosen has also contributed on theater production, he was the originating producer of Michael Weller's Moonchildren first presented at London's Royal Court before transferring to the US. He was the originating producer of Maxine Hong Kingston's "The Woman Warrior" presented in association with The Brekeley Rep, Boston's Huntington , and the Doolittle in Los Angeles.
