Question: Chinua Achebe and Walter Van Tilburg Clark are both what?
Context: The City of Trembling Leaves (1945) is a novel in the semi-autobiographical genre, by Walter Van Tilburg Clark.  The novel is a series of parallel narratives detailing the lives and work of a group of redacted characters named Tim Hazard, Lawrence Black, Mary Turner, Rachel Wells, Marjory Hale, "Walt", (the narrator) and assorted other side-characters. Chike and the River is a children's story by Chinua Achebe.  It was first published in 1966 by Cambridge University Press, with illustrations by Prue Theobalds, and was the first of several children's stories Achebe would write. Track of the Cat is a 1954 film directed by William A. Wellman and starring Robert Mitchum and Teresa Wright.  The film is based on a 1949 adventure novel of the same name by Walter Van Tilburg Clark.  This was Wellman's second adaptation of a Clark novel, the first being "The Ox-Bow Incident".  "Track of the Cat" was produced by John Wayne and Robert Fellows for their Wayne/Fellows production company. Chinua Achebe ( , born Albert Chinụalụmọgụ Achebe; 16 November 1930 – 21 March 2013) was a Nigerian novelist, poet, professor, and critic.  His first novel "Things Fall Apart" (1958), often considered his best, is the most widely read book in modern African literature.  He won the Man Booker International Prize in 2007. The Watchful Gods and Other Stories is a collection of short stories by Walter Van Tilburg Clark published in 1950.  It brings together eight stories and one novella (the title story).  Three of the stories had already appeared in the annual anthology of O. Henry Award-winning stories, most notably "The Wind and the Snow of Winter" which was selected by that anthology, in 1945, as their "first-place winner."  Since this book's publication, two other stories have remained notable: "The Portable Phonograph" and "Hook" have both been widely anthologized since they were published. Walter Van Tilburg Clark (August 3, 1909 – November 10, 1971) was an American novelist, short story writer, and educator.  He ranks as one of Nevada's most distinguished literary figures of the 20th century, and was the first inductee into the 'Nevada Writers Hall of Fame' in 1988.  Two of his novels, "The Ox-Bow Incident" and "The Track of the Cat," were made into films.  As a writer, Clark taught himself to use the familiar materials of the western saga to explore the human psyche and to raise deep philosophical issues. On 1 June 1962 a conference of African literature in the English language, the first African Writers Conference, was held at Makerere University in Kampala, Uganda.  Officially called a "Conference of African Writers of English Expression", it was attended by many prominent African writers, including Chinua Achebe, Wole Soyinka (later Nobel Laureate in Literature), John Pepper Clark, Ezekiel Mphahlele, Bloke Modisane, Lewis Nkosi, Ngũgĩ wa Thiong'o (then known as James Ngugi), Ezekiel Mphahlele, Robert Serumaga, Rajat Neogy (founder of "Transition Magazine").  The conference was "not only the very first major international gathering of writers and critics of African literature on the African continent; it was also held at the very cusp of political independence for most African countries." The Mbari Club was a centre for cultural activity by African writers, artists and musicians that was founded in Ibadan, Nigeria, in 1961 by Ulli Beier, with the involvement of a group of young writers including Wole Soyinka and Chinua Achebe. " Mbari", an Igbo concept related to "creation", was suggested as the name by Achebe.  Among other Mbari members were Christopher Okigbo, J. P. Clark and South African writer Ezekiel Mphahlele, Frances Ademola, Demas Nwoko, Mabel Segun, Uche Okeke, Arthur Nortje and Bruce Onobrakpeya. The Ox-Bow Incident is a 1940 western novel by Walter Van Tilburg Clark in which two drifters are drawn into a lynch mob to find and hang three men presumed to be rustlers and the killers of a local man. Anthills of the Savannah is a 1987 novel by Nigerian writer Chinua Achebe.  It was his fifth novel, first published in the UK 21 years after Achebe's previous one ("A Man of the People" in 1966), and was credited with having "revived his reputation in Britain".  A finalist for the 1987 Booker Prize for Fiction, "Anthills of the Savannah" has been described as the "most important novel to come out of Africa in the [1980s]".  Critics praised the novel upon its release.
Answer: novelist