Lucio D'Ambra (1880–1939) was an Italian writer and film director.
 Born as Renato Manganella, he wrote under the pen name of D'Ambra becoming a celebrated journalist, novelist and film critic.
 A noted film enthusiast, D'Ambra became involved in the cinema in 1911 when he anonymously wrote screenplays.
 From 1916 he formally entered the film industry, setting up his own production company and directing more than twenty films.
 His silent comedies drew comparisons to the films of his German contemporary Ernst Lubitsch.
 In 1922 D'Ambra's company was absorbed into the conglomerate Unione Cinematografica Italiana and he retired from regular filmmaking although he occasionally produced further screenplays.
 In 1937 he published his memoirs, recounting his time working in Italy's early film industry.
D. N. Madhok (22 October 1902 – 9 July 1982) was a prominent lyricist of Bollywood in the 1940s to 1960s.
 He started his career with the 1932 film "Radhey Sham".
 He wrote over 800 songs in his career spanning four decades and was regarded as one of the top lyricist in the 1940s earning himself the soubriquet ""Mahakavi" Madhok".
 Madhok is cited as one of the three "First Generation" of lyricists (1930s to 1950s) along with Kidar Sharma and Kavi Pradeep.
 Apart from writing lyrics, he wrote screenplays and directed films.
 He directed almost 17 films like "Baghdad Ka Chor" (1934), "Mirza Sahiban" (1939), "Biwamangal" (1954) and the Madhubala starrer "Naata" (1955).
Brian Moore (first name ; 25 August 1921 – 11 January 1999), who has been described as "one of the few genuine masters of the contemporary novel", was a novelist and screenwriter from Northern Ireland who emigrated to Canada and later lived in the United States.
 He was acclaimed for the descriptions in his novels of life in Northern Ireland after the Second World War, in particular his explorations of the inter-communal divisions of The Troubles.
 He was awarded the James Tait Black Memorial Prize in 1975 and the inaugural "Sunday Express" Book of the Year award in 1987, and he was shortlisted for the Booker Prize three times (in 1976, 1987 and 1990).
 Moore also wrote screenplays and several of his books were made into films.
Hy Conrad is an American author of mystery fiction.
 He wrote numerous books of crime puzzles.
 Conrad also wrote screenplays for television.
 He was one of the original writers for the comedy-drama series Monk, and also served as co-producer.
Basement Jack is a 2009 American slasher horror film, which was written by Brian Patrick O'Toole and directed by Michael Shelton, it stars Billy Morrison, Tiffany Shepis and Lynn Lowry.
Brian Patrick O'Toole is an American film producer and screenwriter.
 O'Toole's work includes co-producing the 2002 horror film "Dog Soldiers" and his screenwriting debut "Cemetery Gates".
 He also wrote a monthly column for the prominent American magazine "Fangoria" for six years and currently works with Black Gate Entertainment, with whom he has written and produced several films, including "Basement Jack", "Evilution" and the upcoming "Necropolitan" and "A Necessary Evil".
 He also wrote the screenplays for the "Atlas Shrugged" film adaptations.
Atlas Shrugged is a 1957 novel by Ayn Rand.
 Rand's fourth and last novel, it was also her longest, and the one she considered to be her "magnum opus" in the realm of fiction writing.
 "Atlas Shrugged" includes elements of science fiction, mystery, and romance, and it contains Rand's most extensive statement of Objectivism in any of her works of fiction.
Thomas O'Toole was a science reporter and editor at "The Washington Post" from 1966 to 1987.
 His main subject was the space program, in particular the Apollo program to land men on the moon.
 He extensively covered Skylab, the Apollo-Soyuz Test Project, the Voyager program to Jupiter, Saturn and Uranus, and the space shuttle program.
 O'Toole wrote many articles on energy, including the burgeoning nuclear power industry in America.
 He also covered significant espionage stories, from Cold War subjects to Watergate and the hunt for Nazi figures hiding in America and elsewhere after World War 2.
Grigorii Nikitich Gribonosov (Russian: Григо́рий Ники́тич Грибоно́сов ; 5 (18) January 1902, Odessa - 30 March 1960, Moscow) was a Soviet journalist and science fiction and adventure writer, who wrote under the name Grigorii Grebnev (Григо́рий Гребнев).
 He also wrote screenplays, including the adaptation of Alexander Kuprin's story for "The White Poodle" 1956 film.
Reginald Warren Chetham-Strode, MC, (28 January 1896 – 26 April 1974) was an English author and playwright.
 He wrote several plays including "The Guinea Pig" (1946) which was turned into a movie in 1948.
 He also wrote screenplays for several films between 1935 and 1951 including "Odette" (1950).

Question: Who wrote the novel that Brian Patrick O'Toole wrote screenplays for?
Answer: Ayn Rand