Question: Are Glenn Cooper and Roger Zelazny both writers?

full_context: Document 1: Amber Diceless Roleplaying Game: The Amber Diceless Roleplaying Game is a role-playing game created and written by Erick Wujcik, set in the fictional universe created by author Roger Zelazny for his "Chronicles of Amber". The game is unusual in that no dice are used in resolving conflicts or player actions; instead a simple diceless system of comparative ability, and narrative description of the action by the players and gamemaster, is used to determine how situations are resolved.
Document 2: Jack of Shadows: Jack of Shadows is a science fantasy novel by American author Roger Zelazny. According to him, the name of the book (but not the titular character) was an homage to Jack Vance. In his introduction to the novel he mentioned that he tried to capture some of the exotic landscapes that are frequent in Vance's work. Zelazny wrote it in first draft, with no rewrites. The novel was serialized in the " Magazine of Fantasy and Science Fiction" in 1971 and published in book form that same year. It was nominated for a 1972 Hugo Award and finished #4 in the 1972 Locus Poll for Best Novel.
Document 3: The Last Defender of Camelot (short story): "The Last Defender of Camelot" is a fantasy short story by American writer Roger Zelazny, first published in the Summer 1979 issue of "Asimov's SF Adventure Magazine". It was subsequently published as a chapbook by Underwood/Miller for the May 23, 1980 V-Con 8 where Zelazny was guest of honor. The story was also the basis of an 1986 episode of the television series "The Twilight Zone".
Document 4: Bridge of Ashes: Bridge of Ashes is an experimental science fiction novel by author Roger Zelazny. The paperback edition was published in 1976 and the hardcover in 1979. Zelazny describes the book as one of five books from which he learned things “that have borne me through thirty or so others.” He states that he “felt that if I could pull it off I could achieve some powerful effects. What I learned from this book is something of the limits of puzzlement in that no man’s land between suspense and the weakening of communication.”
Document 5: John Grisham: John Ray Grisham Jr. ( ; born February 8, 1955) is an American bestselling writer, attorney, politician, and activist best known for his popular legal thrillers. His books have been translated into 42 languages and published worldwide.
Document 6: Way Up High: Way Up High is a children's book by American writer Roger Zelazny. It is one of two stories he wrote for children, the other being "Here There Be Dragons", and one of three books without heroic protagonists. One thousand copies of each of the two books signed by Zelazny were published in 1992 with illustrations by Vaughn Bodē.
Document 7: Robert Jordan: James Oliver Rigney Jr. (October 17, 1948 – September 16, 2007), better known by his pen name Robert Jordan, was an American author of epic fantasy. He is best known for the "Wheel of Time" series, which comprises 14 books and a prequel novel. He is one of several writers to have written original Conan the Barbarian novels; his are highly acclaimed to this day. Rigney also wrote historical fiction under his pseudonym Reagan O'Neal, a western as Jackson O'Reilly, and dance criticism as Chang Lung. Additionally, he ghostwrote an "international thriller" that is still believed to have been written by someone else.
Document 8: Glenn Cooper: Glenn Cooper (born January 8, 1953) is an American author and physician best known for being an internationally best selling thriller writer. His books have been translated into 31 languages and, as of 2014, have sold over six million copies. He currently lives in Gilford, New Hampshire.
Document 9: Robert Ludlum: Robert Ludlum (May 25, 1927 – March 12, 2001) was an American author of 27 thriller novels, best known as the creator of Jason Bourne from the original "The Bourne Trilogy" series. The number of copies of his books in print is estimated between 290 million and 500 million. They have been published in 33 languages and 40 countries. Ludlum also published books under the pseudonyms Jonathan Ryder and Michael Shepherd.
Document 10: Lemony Snicket bibliography: This is a list of books by Lemony Snicket, the pen name of American author Daniel Handler. Works published under the name Daniel Handler are not included. Snicket has published 26 fiction novels, thirteen in the main "A Series of Unfortunate Events" franchise. His works have been translated into more than 40 languages, and have sold more than 65 million copies.
Document 11: Harlan Coben: Harlan Coben (born January 4, 1962) is an American writer of mystery novels and thrillers. The plots of his novels often involve the resurfacing of unresolved or misinterpreted events in the past, murders, or fatal accidents and have multiple twists. Among his novels are two series, each involving the same protagonist set in and around New York and New Jersey, and some characters appear in both.
Document 12: Dune (novel): Dune is a 1965 epic science fiction novel by American author Frank Herbert, originally published as two separate serials in "Analog" magazine. It tied with Roger Zelazny's "This Immortal" for the Hugo Award in 1966, and it won the inaugural Nebula Award for Best Novel. It is the first installment of the "Dune" saga, and in 2003 was cited as the world's best-selling science fiction novel.
Document 13: James Patterson: James Brendan Patterson (born March 22, 1947) is an American author and philanthropist. Among his works are the "Alex Cross", "Michael Bennett", "Women's Murder Club", "Maximum Ride", "Daniel X", "NYPD Red", "Witch and Wizard", and "Private" series, as well as many stand-alone thrillers, non-fiction and romance novels. His books have sold more than 300 million copies and he was the first person to sell 1 million e-books. In 2016, Patterson topped "Forbes"'s list of highest-paid authors for the third consecutive year, with an income of $95 million. His total income over a decade is estimated at $700 million.
Document 14: Dean Koontz: Dean Ray Koontz (born July 9, 1945) is an American author. His novels are broadly described as suspense thrillers, but also frequently incorporate elements of horror, fantasy, science fiction, mystery, and satire. Many of his books have appeared on "The New York Times" Bestseller List, with 14 hardcovers and 14 paperbacks reaching the number-one position. Koontz wrote under a number of pen names earlier in his career, including "David Axton", "Leigh Nichols", and "Brian Coffey".
Document 15: Roger Zelazny: Roger Joseph Zelazny (May 13, 1937 – June 14, 1995) was an American poet and writer of fantasy and science fiction short stories and novels, best known for "The Chronicles of Amber". He won the Nebula award three times (out of 14 nominations) and the Hugo award six times (also out of 14 nominations), including two Hugos for novels: the serialized novel "...And Call Me Conrad" (1965), subsequently published under the title "This Immortal" (1966) and then the novel "Lord of Light" (1967).
ground_truth: yes