John Trevelyan wurde am 11 Juli 1903 geboren. Er war mit Rosalie Evelyn Lopez-Salzedo, Jean Mutch, Joan Frieda Scott und Kathleen Margaret Pass verheiratet. Er starb am 15 August 1986 in London, England, UK.
British film executive, a parson's son. A former teacher and educational administrator, he became secretary of the British Board of Film Sensors (1958-71). In that capacity, he was responsible for a more liberal attitude towards controversial subjects.
