In 1967, a young researcher named John Birt established his early reputation by persuading the rock star Mick Jagger to appear on "World in Action" to debate youth culture and his recent drug conviction, with Establishment figures, including William Rees-Mogg of "The Times", who had written a famous editorial defending the singer. Jagger so enjoyed the experience that he invited the Granada team to film The Rolling Stones at the band's free 1969 concert in Hyde Park, London. The resulting film, "The Stones in the Park", was one of the iconic concert films of the 1960s. John Birt moved on to edit "World in Action", and eventually became the Director General of the BBC.