On the Black Hill is a novel by Bruce Chatwin published in 1982 and winner of the James Tait Black Memorial Prize for that year.
 In 1987 it was made into a film, directed by Andrew Grieve.
Anatomy of Restlessness was published in 1997 and is a collection of unpublished essays, articles, short stories, and travel tales.
 This collection spans the twenty years of Bruce Chatwin's career as a writer.
 This book was brought together by Jan Borm and Matthew Graves following the death of Chatwin in 1989.
On the Black Hill is a 1987 film directed by Andrew Grieve and based upon the novel of the same name by Bruce Chatwin.
Photographs and Notebooks is a collection of British author Bruce Chatwin's photographs and notebooks that were made during his life when he was working on his various novels and travel books.
 It was published posthumously in 1993 by Jonathan Cape.
The Songlines is a 1987 book written by Bruce Chatwin, combining fiction and non-fiction.
 Chatwin describes a trip to Australia which he has taken for the express purpose of researching Aboriginal song and its connections to nomadic travel.
 Discussions with Australians, many of them Indigenous Australians, yield insights into Outback culture, Aboriginal culture and religion, and the Aboriginal land rights movement.
William Sydney Porter (September 11, 1862 – June 5, 1910), known by his pen name O. Henry, was an American short story writer.
 His stories are known for their surprise endings.
Fathers.
 Subtitled "A Literary Anthology", this is a collection of 49 personal father essays and poems by such eminent writers as Margaret Atwood, Angela Carter, Bruce Chatwin, Winston Churchill, Seamus Heaney, Doris Lessing and Philip Roth.
 In the introduction to the book, the editor, Andre Gerard, suggests that personal writing about fathers is a relatively new phenomenon, one for which he proposes the name of patremoir, and he traces the origins of this kind of writing back to Edmund Gosse’s Father and Son.
 According to Gerard, Gosse helped make it possible to speak intimately and openly about the father.
In Patagonia is an English travel book by Bruce Chatwin, published in 1977.
Charles Bruce Chatwin (13 May 194018 January 1989) was an English travel writer, novelist, and journalist.
 His first book, "In Patagonia" (1977), established Chatwin as a travel writer, although he considered himself instead a storyteller, interested in bringing to light unusual tales.
 He won the James Tait Black Memorial Prize for his novel "On the Black Hill" (1982) and his novel "Utz" (1988) was shortlisted for the Man Booker Prize.
 In 2008 "The Times" named Chatwin #46 on their list of "50 Greatest British Writers Since 1945."
What Am I Doing Here (1988) is a book by British Author Bruce Chatwin and contains a collection of essays, profiles and travel stories from his life.
 It was the last book published during Chatwin's life and draws on various experiences from it.
 These experiences include trekking in Nepal, sailing down the Volga, interviewing Madeleine Vionnet and making a film with Werner Herzog.

Question: Are both Bruce Chatwin and O. Henry writers?
Answer: yes