For the miniseries Jennie: Lady Randolph Churchill (1974), Cellan Jones won the Directors Guild of America Award for Outstanding Directing – Drama Series, and was nominated for a Primetime Emmy Award.
The novel series was adapted into a thirteen-part television serial by David Turner for the BBC in 1970, with Michael Bryant as Mathieu and directed by James Cellan Jones.
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John was recommended to then Doctor Who producer Peter Bryant by another BBC producer, James Cellan Jones, who sent Bryant and his associate Derrick Sherwin photographs of her.
Both his father James Cellan Jones and his half-brother Simon Cellan Jones are film and television directors, although Rory was born out of wedlock and was unacquainted with them until adulthood.