Question: Were both Martin Flavin and George R. R. Martin novelists?

Context articles: Martin Flavin (politician)
Martin Flavin
George R. R. Martin
Calling All Husbands
Journey in the Dark
Laughing Sinners
The Big House (1930 film)
Convicted (1950 film)
Three Who Loved
Love Begins at 20

Martin Flavin (1841– 30 December 1916) was an Irish nationalist politician, butter merchant and prominent businessman from Cork.
 He was a Member of Parliament (MP) from 1891 to 1892 .
Martin Archer Flavin (November 2, 1883 – December 27, 1967) was an American playwright and novelist.
George Raymond Richard Martin (born George Raymond Martin; September 20, 1948), often referred to as George R. R. Martin, is an American novelist and short-story writer in the fantasy, horror, and science fiction genres, screenwriter, and television producer.
 He is best known for his series of epic fantasy novels, "A Song of Ice and Fire", which was later adapted into the HBO series "Game of Thrones" (2011–present).
 Martin serves as the series's co-executive producer, and also scripted four episodes of the series.
Calling All Husbands is a 1940 American comedy film directed by Noel M. Smith and written by Robert E. Kent and based on Martin Flavin's 1929 play "Broken Dishes".
 The film stars George Tobias, Lucile Fairbanks, Ernest Truex, George Reeves, Florence Bates and Charles Halton.
 The film was released by Warner Bros. on September 7, 1940.
Journey in the Dark is a 1943 novel by Martin Flavin.
 It won both the 1943 Harper Prize and the 1944 Pulitzer Prize.
Laughing Sinners is a 1931 American pre-Code Metro-Goldwyn-Mayer feature film starring Joan Crawford and Clark Gable in a story about a cafe entertainer who experiences spiritual redemption.
 The dialogue by Martin Flavin was based upon the play "Torch Song" by Kenyon Nicholson.
 The film was directed by Harry Beaumont.
 "Laughing Sinners" was the second of eight cinematic collaborations between Crawford and Gable.
The Big House is a 1930 American Pre-Code crime drama film directed by George W. Hill, released by Metro-Goldwyn-Mayer, and starring Chester Morris, Wallace Beery, Lewis Stone and Robert Montgomery.
 The supporting cast features Leila Hyams, George F. Marion, J. C. Nugent, Karl Dane and Tom Kennedy.
 The story and dialogue were written by Frances Marion, with additional dialogue by Joe Farnham and Martin Flavin.
 The story was inspired by a spate of prison riots in 1929 and resulting federal investigation.
 In response, George Hill wrote a twenty-seven page story treatment called "The Reign of Terror: A Story of Crime and Punishment".
 Irving Thalberg gave the go ahead for the screenplay and assigned Frances Marion to work with George Hill.
Convicted is a 1950 American crime film noir directed by Henry Levin starring Glenn Ford and Broderick Crawford.
 It was the third Columbia Pictures film adaptation of the 1929 stage play "The Criminal Code" by Martin Flavin, following Howard Hawk's "The Criminal Code" (1931) and John Brahm's "Penitentiary" (1938).
Three Who Loved is a 1931 American Pre-Code drama film directed by George Archainbaud from a screenplay by Beulah Marie Dix based on a story by Pulitzer Prize-winning author Martin Flavin.
 The film revolves around a love triangle (Betty Compson, Conrad Nagel, and Robert Ames).
 It was produced by RKO Pictures, which also distributed the film, releasing it on July 3, 1931.
Love Begins at 20 is a 1936 American comedy film directed by Frank McDonald and written by Dalton Trumbo and Tom Reed, based on the 1929 play "Broken Dishes" by Martin Flavin.
 The film stars Hugh Herbert, Patricia Ellis, Warren Hull, Hobart Cavanaugh, Dorothy Vaughan and Clarence Wilson.
 The film was released by Warner Bros. on August 22, 1936.