Question: What nationality do both Richard Donchian and Jirair Hovnanian share besides American?

Context paragraphs:
Richard Donchian: Richard Davoud Donchian (born September 1905, Hartford, Connecticut – d. 1993) was an Armenian-American commodities and futures trader, and pioneer in the field of managed futures.

Jirair Hovnanian: Jirair S. Hovnanian (June 9, 1927 – August 14, 2007) was an Armenian Iraqi-American home builder based in New Jersey.  Hovnanian's business developed and built over 6,000 houses throughout South Jersey.

German passport: German passports are issued to nationals of Germany for the purpose of international travel.  A German passport is, besides the German ID card and the German Emergency Travel Document (called ""), the only other officially recognised document that German authorities will routinely accept as proof of identity from German citizens.  Besides serving as proof of identity and presumption of German nationality, they facilitate the process of securing assistance from German consular officials abroad (or other EU-members in the case that a German consular facility is absent).  German passports are valid for ten years (for people older than 24) or six years (for people until the age of 24) and share the standardised layout and burgundy red design with other EU passports. Every German citizen is also a citizen of the European Union.  The passport, along with the national identity card allows for free rights of movement and residence in any of the states of the European Union and European Economic Area.

Donchian channel: The Donchian channel is an indicator used in market trading developed by Richard Donchian.  It is formed by taking the highest high and the lowest low of the last "n" periods.  The area between the high and the low is the channel for the period chosen.

Don't Worry, We'll Think of a Title: Don't Worry, We'll Think of a Title is a 1966 American comedy film directed by Harmon Jones and written by Morey Amsterdam, John Davis Hart, William Marks and George Schenck.  The film stars Morey Amsterdam, Rose Marie, Richard Deacon, Joey Adams and Andy Albin.  Besides the credited cast, there are uncredited cameo appearances by Steve Allen, Milton Berle, Carl Reiner, Irene Ryan, Danny Thomas, Forrest Tucker and others, as well as a rare non-Stooge appearance by Moe Howard.  The film was released in May 1966, by United Artists.

Dick Fosbury: Richard Douglas Fosbury (born March 6, 1947) is an American retired high jumper, who is considered one of the most influential and inspirational athletes in the history of track and field.  Besides winning a gold medal at the 1968 Olympics, he revolutionized the high jump event, with a unique "back-first" technique, now known as the Fosbury Flop, adopted by almost all high jumpers today.  His method was to sprint diagonally towards the bar, then curve and leap backwards over the bar, which gave him a much lower center of mass in flight (it was actually below his body) than traditional techniques.  He continues to be involved in athletics and serves on the executive board of the World Olympians Association.  In 2014 Fosbury ran for a seat in the Idaho House of Representatives.

R. M. Koster: Richard Morton Koster (1934) is an American novelist best known for the Tinieblas trilogy—"The Prince" (1972), "The Dissertation" (1975), "Mandragon" (1979)—set in an imaginary Central American republic much like Panama, the author's home for many years.  He is the author, besides, of two other novels, "Carmichael's Dog" (1992) and "Glass Mountain" (2001), and (with Panamanian man of letters Guillermo Sánchez Borbón), of "In the Time of the Tyrants" (1990), a history of the Torrijos-Noriega dictatorship in Panama.

Samoan unification: The unification (or re-unification) of Samoa (or Western Samoa), an independent state, and American Samoa, a US territory, both parts of the Samoan Islands which share ethnicity and culture, has been raised since the first half of the 20th century, following division of the territories by the Great powers (see Tripartite Convention).  In 1919, Western Samoa desired to unite with American Samoa, as already stated in Paris.  However it was instead incorporated as the Western Samoa Trust Territory under British administration from 1920–1946 and New Zealand administration from then until 1962.  The "Inter-Samoan Consultative Committee" was established in 1955, to promote cooperation between the two.  Richard Barrett Lowe, governor of American Samoa (1953–56), stated that it was decided that reunification with Western Samoa was not to be discussed at the Committee.  In 1969, a political commission in American Samoa rejected the unification with independent Samoa.

Shadoe Stevens: Shadoe Stevens (born Terry Keith Ingstad; November 3, 1947) is an American radio host, voiceover actor, and television personality.  He was the host of "American Top 40" from 1988 to 1995.  He currently hosts the internationally syndicated radio show, "Top of the World," and co-hosts "Mental Radio", an entertaining approach to UFOs and paranormal topics.  He is the co-founder and creator of Sammy Hagar's new rock station "Cabo Wabo Radio" broadcasting worldwide from the Cabo Wabo Cantina in Cabo San Lucas, Mexico.  In television, he was the announcer for "The Late Late Show with Craig Ferguson" on CBS, and as of July 2015, now serves as the primary continuity announcer for the Antenna TV network.  His voice can also be heard as the voiceover for "G.O.D." in the Off-Broadway musical "Altar Boyz".  Stevens is also often heard on "Hits & Favorites", calling in at least once a week to share wisdom with his brother Richard Stevens and their friend Lori St. James.

Richie Marquez: Richard "Richie" Marquez (born May 26, 1992) is an American soccer player who currently plays for the Philadelphia Union in Major League Soccer He holds Mexican and American nationality

Supporting paragraphs: Richard Donchian Jirair Hovnanian
Answer: Armenian