Question: Are Irving Wallace and J. K. Rowling both American authors?

Context paragraphs:
Peter Schwed: Peter Schwed (1911-2003) was an American editor and the editorial chairman and a trade book publisher for Simon & Schuster.  Among the authors he edited were P.G. Wodehouse, Irving Wallace, Harold Robbins, David McCullough and Cornelius Ryan.  Schwed also authored or contributed to more than a dozen books.  Schwed specialized in sports publications and was either an editor or ghostwriter for such sports figures as Jack Nicklaus, Rod Laver, Bill Tilden, Chris Evert, Bjorn Borg, Roger Angell and Ted Williams.  He was the co-author of golfer Nancy Lopez's "The Education of a Woman Golfer".

The Book of Predictions: The Book of Predictions was a book published in 1980 and written by David Wallechinsky, Amy Wallace, and Irving Wallace, the authors of "The Book of Lists".  Written in the same type of style (i.e., lists), it includes lists of predictions by scientists, science fiction authors, politicians, and others.

The Seven Minutes (film): The Seven Minutes is a 1971 American drama film directed and produced by Russ Meyer.  The film was based on the 1969 novel of the same name by Irving Wallace.

The Gambler from Natchez: The Gambler from Natchez is a 1954 American adventure film directed by Henry Levin and written by Gerald Drayson Adams and Irving Wallace.  The film stars Dale Robertson, Debra Paget, Thomas Gomez, Lisa Daniels, Kevin McCarthy and Douglas Dick.  The film was released on August 4, 1954, by 20th Century Fox.

The Man (1972 film): The Man is a 1972 political drama directed by Joseph Sargent and starring James Earl Jones.  Jones plays Douglass Dilman, the President pro tempore of the United States Senate, who succeeds to the presidency through a series of unforeseeable events, thereby becoming both the first African American president and the first wholly unelected one.  The screenplay, written by Rod Serling, is largely based upon "The Man", a novel by Irving Wallace.

The Book of Lists: The Book of Lists refers to any one of a series of books compiled by David Wallechinsky, his father Irving Wallace and sister Amy Wallace.

Irving Wallace: Irving Wallace (March 19, 1916 – June 29, 1990) was an American best-selling author and screenwriter.  He was known for his heavily researched novels, many with a sexual theme.  He was a blue-collar writer who wrote for a blue-collar audience.

J. K. Rowling: Joanne Rowling, {'1': ", '2': ", '3': ", '4': "} ( ; born 31 July 1965), who writes under the pen names J. K. Rowling and Robert Galbraith, is a British novelist and screenwriter who wrote the "Harry Potter" fantasy series.  The books have won multiple awards, and sold more than 400 million copies.  They have become the best-selling book series in history and been the basis for a series of films, over which Rowling had overall approval on the scripts and was a producer on the final films in the series.

Mrs. Miller: Elva Ruby Miller (née Connes; October 5, 1907 – July 5, 1997), who recorded under the name "Mrs. Miller", was an American singer who gained some fame in the 1960s for her series of shrill and off-key renditions of popular songs such as "Moon River", "Monday, Monday", "A Lover's Concerto", and "Downtown".  Singing in an untrained, Mermanesque, vibrato-laden style, according to Irving Wallace, David Wallechinsky and Amy Wallace in "The Book of Lists 2," Miller's voice was compared to the sound of "roaches scurrying across a trash can lid."

Warner Bros. Entertainment Inc. v. RDR Books: Warner Bros.  Entertainment, Inc. and J. K. Rowling v. RDR Books, 575 F.Supp.2d 513 (SDNY 2008) is a copyright lawsuit brought on 31 October 2007 by the media company Warner Bros. and "Harry Potter" author J. K. Rowling against RDR Books, an independent publishing company based in Muskegon, Michigan.  Lawyers for Rowling and Time Warner argued that RDR's attempt to publish for profit a print facsimile of "The Harry Potter Lexicon", a free online guide to the "Harry Potter" fictional universe, constituted an infringement of their copyright and was not protected by the affirmative defense of fair use.  The trial was held from 14–17 April 2008 in the United States District Court for the Southern District of New York.  In September 2008, the court ruled in Rowling's favor, and publication of the book was blocked.  In 2009, RDR Books released an edited volume, eliminating the problematic long quotes found to be infringing.

Supporting paragraphs: Irving Wallace J. K. Rowling
Answer: no