Question: Robert Hayden and Anne Tyler, are of which nationality?

Context paragraphs:
Searching for Caleb: Searching for Caleb is Anne Tyler's sixth novel.  It was originally published by Alfred A. Knopf in 1975.

Earthly Possessions (novel): Earthly Possessions is a 1977 novel by Anne Tyler.  This, Tyler's seventh novel, followed "Celestial Navigation" and "Searching for Caleb" and preceded her award-winning novels "Morgan's Passing", "Dinner at the Homesick Restaurant", "The Accidental Tourist", and "Breathing Lessons".

Dinner at the Homesick Restaurant: Dinner at the Homesick Restaurant is a 1982 novel by Anne Tyler set in Baltimore, Maryland.  It is Anne Tyler's ninth novel.  In 1983 it was a finalist for the Pulitzer Prize, the National Book Award, and the PEN/Faulkner Award.  Anne Tyler considers it her best work.

Noah's Compass: Noah's Compass is a novel by Anne Tyler first published in 2009 about a solitary 60-year-old man trying to come to terms with his own life.  Critics agree that in this, Tyler's 18th novel, the author again treads familiar territory by setting her novel in Baltimore and by following the life of an inconspicuous man who has never realised his full potential.

Hayden Gliemmo: Robert Hayden Gliemmo (born November 20, 1978) is an American former baseball player notable for co-winning the "Collegiate Baseball Newspaper" Freshman of the Year honor, alongside Aaron Heilman and Xavier Nady.

Bob Avellini: Robert Hayden Avellini (born August 28, 1953) was a quarterback in the NFL.  For most of his career, he played for the Chicago Bears before finishing with the New York Jets.  His nickname was "Slow-Mo".

A Slipping-Down Life: A Slipping-Down Life is a 1999 romantic drama film directed by Toni Kalem.  Based on a novel by Anne Tyler, it stars Lili Taylor and Guy Pearce.

Anne Tyler: Anne Tyler (born October 25, 1941) is an American novelist, short story writer, and literary critic.  She has published 20 novels, the best known of which are "Dinner at the Homesick Restaurant" (1982), "The Accidental Tourist" (1985), and "Breathing Lessons" (1988).  All three were finalists for the Pulitzer Prize for Fiction with "Breathing Lessons" winning the prize for 1989.  She has also won the Janet Heidinger Kafka Prize, the Ambassador Book Award, and the National Book Critics Circle Award.  In 2012 she was awarded "The Sunday Times" Award for Literary Excellence.  She is recognized for her fully developed characters, her “brilliantly imagined and absolutely accurate detail,” and her “rigorous and artful style” and “astute and open language.”  While many of her characters have been described as quirky or eccentric, she has managed to make them seem real through skillfully fleshing out their inner lives in great depth.  Her subject in all her novels has been the American family and marriage: the boredom and exasperating irritants endured by partners, children, siblings, parents; the desire for freedom pulling against the tethers of attachments and conflicted love; the evolution over time of familial love and sense of duty.  Tyler celebrates unremarkable Americans and the ordinary details of their everyday lives.  Because of her style and subject matter, she has been compared to John Updike, to Jane Austen, and to Eudora Welty, among others.

Robert Hayden: Robert Hayden (4 August 1913 – 25 February 1980) was an American poet, essayist, and educator.  He served as Consultant in Poetry to the Library of Congress from 1976–78, a role today known as US Poet Laureate.  He was the first African-American writer to hold the office.

Stout Bushmaster 2000: The Bushmaster 2000 was a small commuter airliner built in the United States in an attempt to revive the Ford Trimotor design.  Work began in 1953 by testing a vintage Trimotor and in 1954 Bill Stout purchased the design rights to the original Trimotor.  Due to "Ford Tri-Motor" licensing problems, the Ford 15-AT-D was given the Bushmaster 2000 name.  On 15 January 1955, Stout and partner Robert Hayden from the Hayden Aircraft Corporation announced they were planning to build 1,000 new Bushmasters, but it would be eleven years before the first prototype of the new design flew.

Supporting paragraphs: Robert Hayden Anne Tyler
Answer: American