Question: Which documentary film maker was considered the father of British and Canadian documentary film, Roman Karmen or John Grierson?
Context: John Grierson CBE (26 April 1898 – 19 February 1972) was a pioneering Scottish documentary maker, often considered the father of British and Canadian documentary film.  In 1926, Grierson coined the term "documentary" in a review of Robert Flaherty's "Moana". The Nuremberg Trials is a 1947 Soviet-made documentary film about the trials of the Nazi leadership.  It was produced by Roman Karmen, and was an English-language version of the Russian language film "Суд народов" (Judgment of the Peoples). Vast is my Native Land (1958), also known as "Great is my Country", (Russian: Широка страна моя родная , "Shiroka strana moya rodnaya" ), from the song of the same name, which is featured in the film, by the Russian composer Isaac Dunaevsky) was the first film shot in the Soviet wide-screen film format known as Kinopanorama.  The film was directed by Roman Karmen, known for various documentary films produced in the Soviet Union.  The music was composed by Kirill Molchanov, a noted composer of music for ballet and opera. Night Mail is a 1936 documentary film about a London, Midland and Scottish Railway (LMS) mail train from London to Scotland, produced by the GPO Film Unit.  The film ends with a "verse commentary" by W. H. Auden, written for existing footage.  Benjamin Britten scored the film.  The film was directed by Harry Watt and Basil Wright, and narrated by John Grierson and Stuart Legg.  The Brazilian filmmaker Alberto Cavalcanti was sound director.  The locomotive featured in the film was Royal Scot 6115 "Scots Guardsman", built in 1927.  The film has become a classic of its own kind, much imitated by adverts and modern film shorts.  "Night Mail" is widely considered a masterpiece of the British Documentary Film Movement. Jennifer Peedom is an Australian documentary film maker.  Her documentary "Solo" (co-directed with David Michôd) won the 2009 Australian Film Institute Award for Best Documentary in Under One Hour, and her documentary "Sherpa", which was filmed during the 2014 Mount Everest avalanche, won the 2015 Grierson Award for Best Documentary at the BFI London Film Festival.  She was nominated for a BAFTA Award in 2016 for Best Documentary. Documentary News Letter was a magazine about documentary film founded by filmmaker John Grierson.  The publication was developed as the wartime successor to "World Film News", which ceased publication in 1938, and sought to promote a "documentary approach to everyday living."  It published its first edition in January 1940, with an editorial board that consisted of Grierson, Paul Rotha, Basil Wright, Arthur Elton and Thomas Baird. Michael Darlow (born 13 June 1934) is a British television producer, director and writer.  After starting as an actor, his first short film was seen by documentary film maker John Grierson and shown on TV and at the 1960 Edinburgh Film Festival.  Darlow's documentary, drama and arts programmes have won international awards including BAFTAs, an Emmy, and Gold at the New York Television Festival.  His works include The World At War episode "Genocide", The Barretts of Wimpole Street, Johnny Cash at San Quentin and "Bomber Harris".  He is a Fellow of the Royal Television Society. Roman Lazarevich Karmen (Russian: Рома́н Ла́заревич Карме́н ; 29 November [O.S. 16 November] 1906 in Odessa – 28 April 1978 in Moscow) was a Soviet war camera-man and film director and one of the most influential figures in documentary film making. The Grierson Awards celebrate innovative and exciting new documentary films.  The awards have been set up by the Grierson Trust to commemorate the life and work of world-renowned documentary filmmaker John Grierson.  The awards were first set up in 1972 and have run annually.  In 2000 the Grierson Trust forged a link with the UK Film Council in order to expand the awards and add more prestige to the awards.  The awards have grown in stature and recognition over the years and now are "more important (than ever).  They have an impressive list engaging with a broad palette of styles and subjects from disabled people looking for love to asylums, Russian billionaires and global warming." Mira Burt-Wintonick (born July 8, 1984) is a Canadian radio and film producer best known for her audio pieces and work on the CBC radio program "WireTap".  Trained as a classical musician, Burt-Wintonick pursued a Communications degree from Concordia University in Montreal where she currently resides.  Notably, in 2006 Burt-Wintonick was chosen Best New Artist at the Third Coast Festival for her radio essay "Muriel's Message".  Daughter of Canadian documentary film maker Peter Wintonick, Burt-Wintonick co-produced the road-trip documentary "PilgrIMAGE" with her father which was a selection at the International Documentary Film Festival Amsterdam in 2008.
Answer: John Grierson