Mir joined the Film Advisory Board in 1940 during the year of its founding and began making documentary films. It was the first example of direct state documentary film production in India. Mir worked as Chief Producer for them till 1946, producing over 170 films. He also served at the India Film Enterprises and at the Films Division, becoming its Chief Producer at the latter in 1956. The three notable shorts he made for them were Making Money, The Road To Victory and The Voice of Satan in 1940. The Road To Victory was about the proclamation of dictatorship and was effectively directed and narrated by Mir. Voice of Satan was a two-reeler about the propaganda used by the Germans in their broadcasting methods. Both the war documentaries were a production of Wadia Movietone, a co-operative effort with the Film Advisory Board. After the war, he continued documentary work, founding the Indian Documentary Producers Association in 1956, and worked on over 700 documentary films. Mir was appointed Chief Producer of the Ministry of Information's Films Division in 1956. Under his management, the Division made over 100 documentary films per year. Some of his well-known films are ‘Pamposh’ (1954), ‘Do You Know?’ (1958), ‘This Our India’ (1961) and ‘Raju aur Gangaram’ (1964). The lifetime achievement award of the IDPA, given biennially, is instituted in his name. He was awarded the Padma Shri in 1970.