Question: Were Irving Wallace and Muriel Spark writers in the same countries?

Context articles: Loitering with Intent
The Takeover (novel)
The Abbess of Crewe
Nasty Habits (film)
The Comforters
Muriel Spark
Irving Wallace
The Prime of Miss Jean Brodie (novel)
The Prime of Miss Jean Brodie (film)
Samuel Robin Spark

Loitering With Intent is a novel by Scottish author Muriel Spark.
 Published in 1981 by Bodley Head, it was short-listed for the Booker Prize that year.
 It contains many autobiographical references to Spark's early career and was reprinted in 2001 by New Directions, in the US, and in 2007 by Virago Press in the UK (with a foreword by Mark Lawson).
The Takeover is a novel by the Scottish author Muriel Spark.
 It was first published in 1976.
The Abbess of Crewe is a novel published in 1974 by Muriel Spark.
 It is centred on a Catholic convent in Crewe and the political intrigues surrounding the election of a new abbess, after the death of the former.
 It exhibits Spark's typical style of crossing seamlessly between temporal points in the narrative.
 Michael Lindsay-Hogg adapted the novel into his film "Nasty Habits", released in 1977.
 This book is considered an allegorical treatment of the Watergate scandal.
Nasty Habits is a 1977 British comedy film directed by Michael Lindsay-Hogg, starring Glenda Jackson, Melina Mercouri, Rip Torn and Susan Penhaligon.
 It is based on Muriel Spark's novel "The Abbess of Crewe".
The Comforters is the first novel by Scottish author Muriel Spark.
 She drew on experiences as a recent convert to Catholicism and having suffered hallucinations due to using Dexedrine, an amphetamine then available over the counter for dieting.
 Although completed in late 1955, the book was not published until 1957.
 A mutual friend, novelist Alan Barnsley, had sent the proofs to Evelyn Waugh.
 At the time Waugh was writing "The Ordeal of Gilbert Pinfold," which dealt with his own drug-induced hallucinations.
Dame Muriel Sarah Spark DBE, CLit, FRSE, FRSL (née Camberg; 1 February 1918 – 13 April 2006) was a Scottish novelist, short story writer, poet and essayist.
 In 2008, "The Times" named Spark as No. 8 in its list of "the 50 greatest British writers since 1945".
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.
The Prime of Miss Jean Brodie is a novel by Muriel Spark, the best known of her works.
 It first saw publication in "The New Yorker" magazine and was published as a book by Macmillan in 1961.
 The character of Miss Jean Brodie brought Spark international fame and brought her into the first rank of contemporary Scottish literature.
 In 2005, the novel was chosen by "Time" magazine as one of the one hundred best English-language novels from 1923 to present.
 In 1998, the Modern Library ranked "The Prime of Miss Jean Brodie" No. 76 on its list of the 100 best English-language novels of the 20th century.
The Prime of Miss Jean Brodie is a 1969 British drama film, based on the novel of the same name by Muriel Spark.
 Directed by Ronald Neame, it stars Maggie Smith in the title role as an unrestrained teacher at a girls' school in 1930s Edinburgh.
Samuel Robin Spark (9 July 1938 – 6 August 2016) was a Scottish artist.
 He was the son of Sidney Oswald Spark and writer Muriel Spark.