Question: Sako Shahinian and Arshile Gorky, are of which mutual nationality?

Context paragraphs:
De Kooning: An American Master: de Kooning: An American Master is a biography of Dutch American painter Willem de Kooning, a prominent figure in the American movement of abstract expressionism in the thirties and forties.  Often compared to Jackson Pollock and Arshile Gorky, de Kooning was considered one of the more inspirational and influential artists of the 20th century.  The book, which is the first comprehensive biography presenting both de Kooning's personal life and career, was written by authors by Mark Stevens and Annalyn Swan.  In 2005, the book was honored with the 2005 Pulitzer Prize for Biography or Autobiography.

Leonard Rosenfeld: Leonard Rosenfeld (December 14, 1926 – December 2, 2009) was an American expressionist artist who was born in Brooklyn, New York.  In the Post-World War II era, Rosenfeld associated with a group of artist known as the New York School.  His contemporaries and prominent New York School artists included Willem de Kooning, Franz Kline, Arshile Gorky, Mark Rothko, Clyfford Still, and Robert Motherwell.

Sako Shahinian: Sako Shahinian (Armenian: Սաքո Շահինյան ; born 1980) is an American-Armenian illustrator whose artwork has been featured in System of a Down projects.

Matthew Spender: Matthew Spender (born 1945) is an English sculptor.  He is the author of "From a High Place: A Life of Arshile Gorky" (1999), a biography of his father-in-law, the artist Arshile Gorky, and "A House in St John's Wood" (2015), about his father, the poet Stephen Spender.

Shahen Khachatrian: Shahen Gevorki Khachatryan (born September 28, 1934, Aleppo) is an Armenian art expert.  He is the founding director of the Arshile Gorky Museum in Etchmiadzin.

Newark Metropolitan Airport Buildings: The Newark Metropolitan Airport Buildings are at Newark Liberty International Airport in Newark, New Jersey.  Newark Metropolitan, opened in 1928, was the first major airport in the United States.  The trio of Art Deco buildings, the Administration Building, Brewster Hangar and the Medical Building, were built in 1934 and dedicated by Amelia Earhart in 1935.  They were added to state and federal registers of historic places in 1980.  In 2001, the Administration Building was relocated when a runway was lengthened, and they have subsequently been renovated.  The terminal was once adorned with murals by Arshile Gorky, only two of which survive and are part of the Newark Museum collection

Arshile Gorky: Arshile Gorky ( ; born Vostanik Manoug Adoian, Armenian: Ոստանիկ Մանուկ Ատոյեան ; April 15, 1904 – July 21, 1948) was an Armenian-American painter, who had a seminal influence on Abstract Expressionism.  He spent most his life as a national of the United States.  Along with Mark Rothko, Jackson Pollock and Willem de Kooning, Gorky has been hailed as one of the most powerful American painters of the 20th century.  As such, his works were often speculated to have been informed by the suffering and loss he experienced in the Armenian Genocide.

Cool Gardens: Cool Gardens is a poetry book by the lead singer of the band System of a Down, Serj Tankian.  It was published by MTV Books and was released on October 1, 2002.  It is a collection of seven to eight years of Tankian's reflections on life, and features artwork by fellow Angeleno, Sako Shahinian.  The poetry, like the songs of System of a Down, consists of a reflection of societies and people's wrongs.  It portrays what people do to themselves and the control others try to hold over them.

Robert Coates (critic): Robert Myron Coates (April 6, 1897 – February 8, 1973) was an American writer and a long-term art critic for the "New Yorker".  He coined the term "abstract expressionism" in 1946 in reference to the works of Arshile Gorky, Jackson Pollock and Willem de Kooning.

Roy Newell: An American abstract painter, Roy Newell was born in Manhattan's Lower East Side on May 10, 1914, and died of cancer on November 22, 2006, in Manhattan.  His paintings are typified by richly-hued geometric forms in subtle juxtapositions and textures, heightened by an intimate scale and striking color harmonies.  He participated in the Group of American Abstract Expressionists and was a founding member of the 8th Street Artist Club, which also included Willem de Kooning, Arshile Gorky, Franz Kline and Philip Pavia.

Supporting paragraphs: Sako Shahinian Arshile Gorky
Answer: American-Armenian