Question: Are Kenneth Clark and William March both British?

full_context: Document 1: Kenneth and Mamie Clark: Kenneth Bancroft Clark (July 14, 1914 – May 1, 2005) and Mamie Phipps Clark (April 18, 1917 – August 11, 1983) were African-American psychologists who as a married team conducted important research among children and were active in the Civil Rights Movement. They founded the Northside Center for Child Development in Harlem and the organization Harlem Youth Opportunities Unlimited (HARYOU). Kenneth Clark also was an educator and professor at City College of New York, and first black president of the American Psychological Association.
Document 2: The Two Worlds of William March: The Two Worlds of William March is a 1984 biography of William March, written by the British scholar, critic and author Roy S. Simmonds. William Butcher, reviewing the biography for "World Literature Today", called it "a judicious record of March's life and a fine tribute to his literary achievement".
Document 3: Kenneth Clark: Kenneth Mackenzie Clark, Baron Clark, (13 July 1903 – 21 May 1983) was a British art historian, museum director, and broadcaster. After running two important art galleries in the 1930s and 1940s, he came to wider public notice on television, presenting a succession of series about the arts during the 1950s and 1960s, culminating in the series "Civilisation" in 1969.
Document 4: Three Soldiers: Three Soldiers is a 1921 novel by the American writer and critic John Dos Passos. It is one of the American war novels of the First World War, and remains a classic of the realist war novel genre. H.L. Mencken, then practising primarily as an American literary critic, praised the book in the pages of "The Smart Set". "Until "Three Soldiers" is forgotten and fancy achieves its inevitable victory over fact, no war story can be written in the United States without challenging comparison with it—and no story that is less meticulously true will stand up to it. At one blast it disposed of oceans of romance and blather. It changed the whole tone of American opinion about the war; it even changed the recollections of actual veterans of the war. They saw, no doubt, substantially what Dos Passos saw, but it took his bold realism to disentangle their recollections from the prevailing buncombe and sentimentality."
Document 5: Clive Phillpot: Clive Phillpot is a specialist on artists' books, essayist, art writer, curator, and a librarian. Phillpot started his library career at the Charing Cross Public Library in London. He is a former librarian at the Chelsea School of Art in London, and served as the Director of the Library at the Museum of Modern Art in New York from 1977 to 1994. After his departure from the Library at the Museum of Modern Art, Phillpot pursued freelance work, writing, and curating exhibitions. While serving as the head of the MoMA's library, Phillpot founded and curated the Artist Book Collection, established in 1977. Phillpot was an active supporter of the New York art world during the 1980s. He contributed to artist exhibition catalogues (including the catalogue for The Art Press, an exhibition on the history of art magazines), conducted artist interviews, wrote essays on artists, and contributed a column titled "Feedback" to the art magazine Studio International. In 2013, JRP-Ringier published a collection of Clive Phillpot's essays and interviews, titled "Booktrek: Selected Essays on Artists' Books (1972-2010)". Phillpot served on the boards of Center for Book Arts, Franklin Furnace Archive, and the New York State Council on the Arts. From 1980-1994, Clive Phillpot served as a Board Member for Printed Matter, and served as the president of Printed Matter from 1992-1993.
Document 6: William March: William March (September 18, 1893 – May 15, 1954) was an American writer of psychological fiction and a highly decorated US Marine. The author of six novels and four short-story collections, March was praised by critics but never attained great popularity.
Document 7: What is a Masterpiece?: What is a Masterpiece? is a 1979 non-fiction book by British historian Kenneth Clark. It is a transcribed version of the Walter Neurath memorial lectures given by Clark. The work, initially released on 1 January 1979, received a Thames & Hudson republication on 1 May 1992.
Document 8: Melvyn Bragg: Melvyn Bragg, Baron Bragg, {'1': ", '2': ", '3': ", '4': "} , (born 6 October 1939) is an English broadcaster, author and parliamentarian. He is best known for his work with ITV as editor and presenter of "The South Bank Show" (1978–2010), and for the Radio 4 discussion series "In Our Time".
Document 9: China Marine (memoir): China Marine: An Infantryman's Life after World War II is the second memoir written by United States Marine Corporal Eugene B. Sledge, published posthumously with foreword by Stephen E. Ambrose, without subtitle, on May 10, 2002 by University of Alabama Press It was republished in paperback with the full title by Oxford University Press in July 2003. This book is the sequel to his first, better known, memoir, "With the Old Breed: At Peleliu and Okinawa" and Ambrose identifies it as the only account of the Marines stationed in postwar China. It has recently achieved wider public recognition as credited source material for the 2010 HBO miniseries "The Pacific".
Document 10: Classicism: Classicism, in the arts, refers generally to a high regard for a classical period, classical antiquity in the Western tradition, as setting standards for taste which the classicists seek to emulate. The art of classicism typically seeks to be formal and restrained: of the "Discobolus" Sir Kenneth Clark observed, "if we object to his restraint and compression we are simply objecting to the classicism of classic art. A violent emphasis or a sudden acceleration of rhythmic movement would have destroyed those qualities of balance and completeness through which it retained until the present century its position of authority in the restricted repertoire of visual images." Classicism, as Clark noted, implies a canon of widely accepted ideal forms, whether in the Western canon that he was examining in "The Nude" (1956), or the literary Chinese classics or Chinese art, where the revival of classic styles is also a recurring feature.
Document 11: Soldiers' Pay: Soldiers' Pay is the first novel published by the American author William Faulkner. It was originally published by Boni & Liveright on February 25, 1926. It is unclear if Soldiers' Pay is the first novel written by Faulkner. It is however the first novel published by the author. Faulkner was working on two manuscripts while finishing Soldiers' Pay.
Document 12: James Burke (science historian): James Burke (born 22 December 1936) is a British broadcaster, science historian, author, and television producer, who is known, among other things, for his documentary television series "Connections" (1978), and for its more philosophically oriented companion series, "The Day the Universe Changed" (1985), which is about the history of science and technology. "The Washington Post" called him "one of the most intriguing minds in the Western world".
Document 13: William S. Burroughs: William Seward Burroughs II ( ; February 5, 1914 – August 2, 1997) was an American writer and artist. Burroughs was a primary figure of the Beat Generation and a major postmodernist author whose influence is considered to have affected a range of popular culture as well as literature. Burroughs wrote eighteen novels and novellas, six collections of short stories and four collections of essays. Five books have been published of his interviews and correspondences. He also collaborated on projects and recordings with numerous performers and musicians, and made many appearances in films. He was also briefly known by the pen name William Lee. Burroughs created and exhibited thousands of paintings and other visual art works, including his celebrated 'Gunshot Paintings'.
Document 14: John Richardson (art historian): Sir John Patrick Richardson, KBE, FBA (born 6 February 1924) is a British art historian and Picasso biographer. Richardson has also worked as an industrial designer and as a reviewer for "The New Observer". In 1952, he moved to Provence, where he became friends with Picasso, Léger and de Staël. In 1960, he moved to New York and organized a nine-gallery Picasso retrospective. Christie's then appointed him to open their US office, which he ran for the next nine years. In 1973 he joined New York gallery M. Knoedler & Co., Inc., as vice president in charge of 19th- and 20th-century painting, and later became managing director of Artemis, a mutual fund specializing in works of art.
Document 15: Mark Wisniewski: Pushcart Prize winner and Best American Short Stories author Mark Wisniewskis third novel, "Watch Me Go" (Penguin Putnam, January 22, 2015), received early praise from Salman Rushdie, Ben Fountain, and Daniel Woodrell. Mark's first novel, "Confessions of a Polish Used Car Salesman", was praised by the "Los Angeles Times", the "Chicago Tribune", the "Milwaukee Journal-Sentinel", and C. Michael Curtis of "The Atlantic Monthly". Wisniewski's second novel, "Show Up, Look Good", was praised by Ben Fountain, "Kirkus Reviews", "Publishers Weekly", "Psychology Today"' s Creativity Blog, Jonathan Lethem, Christine Sneed, Molly Giles, Richard Burgin, Kelly Cherry, Diana Spechler, DeWitt Henry, and T.R. Hummer.
ground_truth: no