Fred Wiseman is one of the world's greatest living documentary makers.
Throughout his long career he has studied the institutions of contemporary life - from hospital wards to high school classrooms, from army basic training, to now a ballet company.
The BBC caught up with him to talk about his latest film "La Danse - Le Ballet de l'Opera de Paris", which is released in the UK on April 23rd.
World News Today with Zeinab Badawi is broadcast weekdays at 1900, 1930 and 2000 GMT on the BBC World News channel. Find out more information about regional broadcast times