Garga is one of India's most eminent film scholars and a founder member of the National Film Archive, Pune. He began working in films under V. Shantaram and has written, directed and produced over fifty documentary films.

In the fifties, Garga worked with various film units in Europe and at the Mosfilm Studios, Moscow. He later served as a member of the film advisory board and was honoured by the Film Federation of India for his contribution to the growth of cinema in the country.

He is also the author of 'The Art of Cinema: An Insider's Journey through Fifty Years of Film History (published by Penguin-India)' and 'Indian Cinema: A Passage to Bollywood', which will be published by Penguin soon.