Are both Norman Rush and J. P. Donleavy of Irish heritage?
no
J. P. Donleavy
James Patrick Donleavy (23 April 1926 – 11 September 2017) was an Irish-American novelist and playwright.
 His best-known work is the novel "The Ginger Man", which was initially banned for obscenity.
Norman Rush
Norman Rush (born October 24, 1933, San Francisco, California) is an American writer whose introspective novels and short stories are set in Botswana in the 1980s.
A Fairy Tale of New York
A Fairy Tale of New York is a novel by Irish American writer J. P. Donleavy, published in 1973.
 The plot concerns Irish-American Cornelius Christian's return to New York after studying in Ireland.
 The novel was based on Donleavy's earlier work "Fairy Tales of New York", a successful stage play published in 1961. List of expatriate Irish populations
An expatriate Irish population in any country other than Ireland or Northern Ireland is generally considered to be Irish emigrants and their descendants, at least to the extent that the people involved are aware of their Irish heritage and willing to acknowledge it.
 This definition applies to over 80 million people, considerably more than the 3 million of Irish nationality who reside in other countries.
 This smaller group is defined by the government of Ireland in legal terms as those of Irish nationality who habitually reside outside of the island of Ireland.
 It includes Irish citizens who have emigrated abroad and their children, who are Irish citizens by descent under Irish law.
 It also includes their grandchildren in cases where they were registered as Irish citizens in the Foreign Births Register held in every Irish diplomatic mission. Alex Epstein (Israeli writer)
Alex Epstein (Hebrew: אלכס אפשטיין, born 1971, Saint Petersburg) is an Israeli writer, known for his micro stories.
 He moved to Israel at the age of eight and lived with his family in the city of Lod.
 Epstein received his first publishing contract from Zamora-Bitan when he was only 23.
 He has since published three novels and eight collections of stories in Hebrew, as well as numerous pieces in English-language journals including "Ploughshares", "The Kenyon Review", "Guernica", "JuxtaProse Literary Magazine", "Zeek," "Electric Literature", "The" "Guardian""," and "The Collagist".
 His translations in "Electric Literature" were illustrated by renowned Israeli artist and animator, David Polonsky.
 Epstein has twice received the (2003; 2016).
 Epstein lives in Tel Aviv and has served as a writer-in-residence for the International Writing Program at the University of Iowa, and as a Schusterman Family Foundation Artist-in-Residence at the University of Denver in Denver, Colorado (2010).
 In 2010 he took part of the PEN World Voices Festival in New York, he was featured in a panel with other writers such as Claire Messud, Lorraine Adams, Norman Rush, Yiyun Li and Aleksandar Hemon. Mating (novel)
Mating (1991) is a novel by American author Norman Rush.
 It is a first-person narrative by an unnamed American anthropology graduate student in Botswana around 1980.
 It focuses on her relationship with Nelson Denoon, a controversial American anthropologist who has founded an experimental matriarchal village in the Kalahari desert. Irish Canadians
Irish Canadians (Irish: "Gaedheal-Cheanadaigh" ) are Canadian citizens who have full or partial Irish heritage including descendants who trace their ancestry to immigrants who originated in Ireland.
 1.2 million Irish immigrants arrived from 1825 to 1970, and at least half of those in the period from 1831–1850.
 By 1867, they were the second largest ethnic group (after the French), and comprised 24% of Canada's population.
 The 1931 national census counted 1,230,000 Canadians of Irish descent, half of whom lived in Ontario.
 About one-third were Catholic in 1931 and two-thirds Protestant. Chicago Rose of Tralee
is a part of the Irish international competition Rose of Tralee (festival) in which one young woman, of Irish ancestry, is crowned the Chicago Rose of Tralee.
 The winner of the Chicago Rose of Tralee is based on personality, integrity, intellect and whether or not they would be a good role model and representative of Irish heritage and culture.
 This Chicago event is held each March at the Irish American Heritage Center and has been previously held at the Beverly Arts Center. American Committee for Relief in Ireland
The American Committee for Relief in Ireland was formed through the initiative of Dr. William J. Maloney and others in 1920, with the intention of giving financial assistance to civilians in Ireland who had been injured or suffered severe financial hardship due to the ongoing Irish War of Independence.
 It was only one of several US based philanthropic organisations that emerged following World War I with a view to influencing the post-war settlement from their perspective of social justice, economic development and long term stability in Europe.
 Some of them concentrated their efforts on events in Ireland, and while activists of Irish ethnicity were well represented, membership was far from confined to Americans of Irish heritage.
 Apart from the ACRI, bodies such as the American Commission on Irish Independence and the American Commission on Conditions in Ireland raised money and attempted to influence US foreign policy in a manner sympathetic to the goal of Irish secession from the United Kingdom. Mortals (novel)
Mortals is the second novel by American author Norman Rush, and was published in 2003.
 The close third-person narrative follows Ray Finch, an American anthropology CIA agent student in Botswana after the collapse of the Soviet Union.
 Ray suspects his beloved wife Iris of an affair with Davis Morel, a Harvard-educated eclectic medicine practitioner and anti-theist with a mission to rid Africa of religion, Christianity in particular.