Question: John Gunther and Halldór Laxness, are American?

full_context: Document 1: Independent People: Independent People (Icelandic: "Sjálfstætt fólk" ) is an epic novel by Nobel laureate Halldór Laxness, originally published in two volumes in 1934 and 1935; literally the title means "Self-standing [i.e. self-reliant] folk". It deals with the struggle of poor Icelandic farmers in the early 20th century, only freed from debt bondage in the last generation, and surviving on isolated crofts in an inhospitable landscape.
Document 2: A Death in the Family: A Death in the Family is an autobiographical novel by author James Agee, set in Knoxville, Tennessee. He began writing it in 1948, but it was not quite complete when he died in 1955 (with reputedly many portions having been written in the home of his friend Frances Wickes). It was edited and released posthumously in 1957 by editor David McDowell. Agee's widow and children were left with little money after Agee's death and McDowell wanted to help them by publishing the work. Agee won the Pulitzer Prize for Fiction in 1958 for the novel. The novel was included on "Time"'s 2005 list of the 100 best English-language novels written since 1923.
Document 3: Halldór Laxness (album): "For the Nobel Prize–winning Icelandic author, see Halldór Laxness"
Document 4: List of Icelandic films: The following is a list of notable films produced in Iceland by Icelanders. Star marked films are films in coproduction with Iceland. Although Arne Mattsson is Swedish, his film is included because it is based on a book by the Icelandic Nobel Prize-winning author Halldór Laxness.
Document 5: The Atom Station: The Atom Station (Icelandic: "Atómstöðin" ) is a novel by Icelandic author Halldór Laxness, who was awarded the Nobel Prize in Literature in 1955. The initial print run sold out on the day it was published, for the first time in Icelandic history.
Document 6: John Gilmore (writer): John "Jonathan" Gilmore (July 5, 1935 - October 13, 2016) was an American author and gonzo journalist known for iconoclastic Hollywood memoirs, true crime literature and hard-boiled fiction. A motion picture, television and stage actor in Los Angeles and New York in the 1950s, his friends including James Dean and Marilyn Monroe, Gilmore has also written about his encounter with Elizabeth Short a.k.a. "The Black Dahlia" during his youth. Gilmore emerged as a writer from the Beat Generation in the '60s, influenced by Jack Kerouac and befriended by author William S. Burroughs. The publication of his true crime book "Severed: The True Story of the Black Dahlia," ushered in a cult following for the author. His manuscripts and original writings are housed in the special collections department of the Research Library of the University of California at Los Angeles.
Document 7: Lou Cannon: Louis Cannon (born 1933) is an American journalist, non-fiction author, and biographer. He was state bureau chief for the "San Jose Mercury News" in the late 1960s and later senior White House correspondent of the "Washington Post" during the Ronald Reagan administration. He is a prolific biographer of US President Ronald Reagan and has written five books about him.
Document 8: Auður Laxness: Auður Sveinsdóttir Laxness (1918-2012) was an Icelandic writer and craftswoman, credited with influencing the design and popularity of the Icelandic Lopapeysa sweater during the mid-20th century. Her husband was Icelandic Nobel Literature laureate Halldór Laxness, and Auður worked as his secretary and writing collaborator for many years.
Document 9: The Journalist and the Murderer: The Journalist and the Murderer is a study by Janet Malcolm about the ethics of journalism, published by Alfred A. Knopf/Random House in 1990. It is an examination of the professional choices that shape a work of non-fiction, as well as a rumination on the morality that underpins the journalistic enterprise. The journalist in question is Joe McGinniss; the murderer is the former Special Forces captain Dr. Jeffrey R. MacDonald, who became the subject of McGinniss' 1983 book "Fatal Vision".
Document 10: John Gunther: John Gunther (August 30, 1901 – May 29, 1970) was an American journalist and author whose success came primarily through a series of popular sociopolitical works known as the "Inside" books (1936–1972), including the best-selling "Inside U.S.A." in 1947. He is best known today for the memoir "Death Be Not Proud" about the death of his beloved teenage son, Johnny Gunther, from a brain tumor.
Document 11: John Hersey: John Richard Hersey (June 17, 1914 – March 24, 1993) was an American writer and journalist. He is considered one of the earliest practitioners of the so-called New Journalism, in which storytelling techniques of fiction are adapted to non-fiction reportage. Hersey's account of the aftermath of the atomic bomb dropped on Hiroshima, Japan, was adjudged the finest piece of American journalism of the 20th century by a 36-member panel associated with New York University's journalism department.
Document 12: James Agee: James Rufus Agee ( ; November 27, 1909 – May 16, 1955) was an American novelist, journalist, poet, screenwriter and film critic. In the 1940s, he was one of the most influential film critics in the U.S. His autobiographical novel, "A Death in the Family" (1957), won the author a posthumous 1958 Pulitzer Prize.
Document 13: Memoir of Halldór Laxness: Memoir of Halldór Laxness was published in Iceland from 2003. It is the memoir of novelist and Nobel Laureate, Halldór Laxnessf> and is in three volumes:
Document 14: Halldór Laxness: Halldór Kiljan Laxness (] ; born Halldór Guðjónsson; 23 April 1902 – 8 February 1998) was a twentieth-century Icelandic writer. Laxness wrote poetry, newspaper articles, plays, travelogues, short stories, and novels. Major influences included August Strindberg, Sigmund Freud, Sinclair Lewis, Upton Sinclair, Bertolt Brecht and Ernest Hemingway. In 1955 he was awarded the Nobel Prize in Literature; he is the only Icelandic Nobel laureate.
Document 15: John Green (author): John Michael Green (born August 24, 1977) is an American author, vlogger, writer, producer, actor and editor. He won the 2006 Printz Award for his debut novel, "Looking for Alaska", and his sixth novel, "The Fault in Our Stars", debuted at number one on "The New York Times" Best Seller list in January 2012. The 2014 film adaptation opened at number one at the box office. In 2014, Green was included in "Time" magazine's list of The 100 Most Influential People in the World. Another film based on a Green novel, "Paper Towns", was released on July 24, 2015.
ground_truth: no