Question: Who is a bestselling American writer known for his fictional and non-fictional accounts of police work in the United States, Joseph Wambaugh or Helen Zahavi?

full_context: Document 1: Helen Zahavi: Helen Zahavi (born 1966) is an English novelist and screenwriter born and educated in London. Her father was sent to Britain with the Polish Army during the Second World War and her mother's parents came from Odessa. Before becoming a writer Zahavi worked as a Russian translator, and has spent several years living in Paris.
Document 2: Robert B. Parker: Robert Brown Parker (September 17, 1932 – January 18, 2010) was an American writer of fiction, primarily of the mystery/detective genre. His most famous works were the 40 novels written about the private detective Spenser. ABC television network developed the television series "" based on the character in the mid-1980s; a series of TV movies based on the character were also produced. His works incorporate encyclopedic knowledge of the Boston metropolitan area. The Spenser novels have been cited by critics and bestselling authors such as Robert Crais, Harlan Coben and Dennis Lehane as not only influencing their own work but reviving and changing the detective genre. Parker also wrote two other series based on an individual character: He wrote nine novels based on the character Jesse Stone and six novels based on the character Sunny Randall. Mr. Parker wrote four Westerns starring the duo Virgil Cole and Everett Hitch. The first, Appaloosa, was made into a film with Ed Harris.
Document 3: The Laughing Policeman (novel): The Laughing Policeman (1968), by Sjöwall and Wahlöö, is the fourth of ten novels featuring Detective Martin Beck. Originally published in Sweden in 1968 as "Den skrattande polisen", it is the first novel in the series to criticize the shortcomings of the Swedish welfare state. In 1971, "The Laughing Policeman" earned a 'Best Novel' Edgar Award from the Mystery Writers of America. The American police procedural film, "The Laughing Policeman" (1973), is a loose adaptation of the novel.
Document 4: Helen Weaver: Helen Weaver (born 1931, Madison, Wisconsin) is an American writer and translator. She has translated over fifty books from French. "Antonin Artaud: Selected Writings" was a Finalist for the National Book Award in translation in 1977.
Document 5: Joseph Wambaugh: Joseph Aloysius Wambaugh, Jr. (born January 22, 1937) is a bestselling American writer known for his fictional and non-fictional accounts of police work in the United States. Several of his first novels were set in Los Angeles, California, and its surroundings, and featured Los Angeles police officers as protagonists.
Document 6: Paula Hawkins (author): Paula Hawkins (born 26 August 1972) is a Zimbabwe-born British author, best known for her best-selling psychological thriller novel "The Girl on the Train" (2015), which deals with themes of domestic violence, alcohol, and drug abuse. The novel was adapted into a film starring Emily Blunt in 2016. Hawkins' second novel, "Into the Water", was released in 2017.
Document 7: Wilhelm Dichter: Wilhelm Dichter is a Polish American writer who has written three novels based on his life. He was born in 1935 in Borysław (in modern-day Ukraine), where he survived the war. His father had died, and he and his mother (remarried after the war) came to live in Poland toward the end of 1944. He finished his studies at the Warsaw Polytechnic, where he earned his doctorate in mechanical engineering and worked for 13 years until 1968. The antisemitic campaign in 1968 in Poland provided the opportunity for him and his family to emigrate, through Vienna and Rome, eventually settling in the United States. As an expert in ballistics, he worked at Colt Firearms in the R&D division on Long Island, New York, and later in Hartford Connecticut. In 1978, he made a transition to the field of image processing, becoming an image processing algorithm design specialist at the Linotype-Hell company. Wilhelm Dichter is now retired from his engineering and scientific work. When he is not writing, Wilhelm and his wife Ola spend quality time with their grandchildren. He and Ola live in the Boston area.
Document 8: Louis L'Amour: Louis Dearborn L'Amour ( ; March 22 1908 –June 10 1988) was an American novelist and short story writer. His books consisted primarily of Western novels (though he called his work 'frontier stories'); however, he also wrote historical fiction ("The Walking Drum"), science fiction ("The Haunted Mesa"), non-fiction ("Frontier"), as well as poetry and short-story collections. Many of his stories were made into films and John Wayne once made the dubious assertion that L'Amour was the most interesting man in the world. L'Amour's books remain popular and most have gone through multiple printings. At the time of his death almost all of his 105 existing works (89 novels, 14 short-story collections, and two full-length works of nonfiction) were still in print, and he was considered "one of the world's most popular writers".
Document 9: Elena Gaussen: Elena Gaussen (previously known as Elena Gaussen-Marks) is a London-based portrait painter. She was divorced from screenwriter and cryptographer Leo Marks in 2000. Gaussen produces portraits and landscapes in a variety of media including pencil sketches. She painted a portrait of Helene Hanff during Hanff's 1971 visit to London, as documented in Hanff's 1973 book "The Duchess of Bloomsbury Street". Gaussen's "Portrait of the Artist" was included in the 1992 Annual Exhibition by the Royal Society of Portrait Painters. Gaussen illustrated a 1999 book release of Marks's famous poem "The Life That I Have".
Document 10: The Secrets of Harry Bright: The Secrets of Harry Bright is the seventh novel written by former Los Angeles Police Department detective Joseph Wambaugh. Published in 1985, the book continues a pattern of Wambaugh crime fiction beginning with "The Choirboys" that uses black humor to explore the psychological effects of prolonged stress on veteran police officers. As with all his novels, "The Secrets of Harry Bright", set in November 1984, is contemporaneous with the time frame in which it was written and includes numerous allusions and references to events and personalities of the time.
Document 11: Michael Wiley (author): Michael Wiley writes the award-winning Joe Kozmarski hard-boiled detective mystery series, including the books "The Last Striptease" (2007), "The Bad Kitty Lounge" (2010), and "A Bad Night's Sleep" (2011). The series is set in contemporary Chicago. "The Last Striptease" won the PWA/SMP (Private Eye Writers of America/St. Martin's Press) prize for Best First Novel and was a nominee for a Shamus Award in the same category. "A Bad Night's Sleep" won the Best Hardback Shamus Award in 2012. Wiley's fiction has been praised broadly for reinvigorating the conventions of private detective novels, earning comparisons to Raymond Chandler and Dashiell Hammett along with other practitioners of PI writing.
Document 12: James Ellroy: Lee Earle "James" Ellroy (born March 4, 1948) is an American crime fiction writer and essayist. Ellroy has become known for a telegrammatic prose style in his most recent work, wherein he frequently omits connecting words and uses only short, staccato sentences, and in particular for the novels "The Black Dahlia" (1987), "The Big Nowhere" (1988), "L.A. Confidential" (1990), "White Jazz" (1992), "American Tabloid" (1995), "The Cold Six Thousand" (2001), and "Blood's a Rover" (2009).
Document 13: Helen Fielding: Helen Fielding is an English novelist and screenwriter, best known as the creator of the fictional character Bridget Jones, and a sequence of novels and films beginning with the life of a thirtysomething singleton in London trying to make sense of life and love. "Bridget Jones's Diary" (1996) and " " (1999) were published in 40 countries and sold more than 15 million copies. The two films of the same name achieved international success. In a survey conducted by "The Guardian" newspaper, "Bridget Jones’s Diary" was named as one of the ten novels that best defined the 20th century.
Document 14: The New Centurions (novel): The New Centurions, written by Joseph Wambaugh, is a 1971 novel depicting the stresses of police work in Los Angeles, California in the early 1960s. The author wrote the novel, his first, while a working member of the Los Angeles Police Department. The novel became a film starring George C. Scott and Stacy Keach.
Document 15: Avivah Gottlieb Zornberg: Dr. Avivah Gottlieb Zornberg (born March 1944) is a Scottish contemporary Torah scholar and author. She was born in London, England, grew up in Glasgow, Scotland, and moved to Israel in 1969, where she currently resides in Jerusalem. Zornberg's father was Rabbi Dr. Wolf Gottlieb, Rabbi at Queen's Park Synagogue, Glasgow and head of Glasgow's rabbinical court (av beit din). Zornberg is a descendant of prominent rabbis from Eastern Europe. Her parents settled in Austria. Zornberg's family fled Austria after the Nazi takeover which led to the collapse of Jewish life and subsequent genocide of the Holocaust. Zornberg holds a PhD from Cambridge University in English Literature.
ground_truth: Joseph Aloysius Wambaugh, Jr.