In 1970, the director/producer John Goldschmidt made a documentary film, "Doing Her Own Thing", about Mirren during her time with the Royal Shakespeare Company. The film was made for ATV and shown on the ITV Network in the UK. In 1972 and 1973, Mirren worked with Peter Brook's International Centre for Theatre Research, and joined the group's tour in North Africa and the US, during which they created "The Conference of the Birds". She then rejoined the RSC, playing Lady Macbeth at Stratford in 1974 and at the Aldwych Theatre in 1975.