Question: What was the nationality of the animator who established Sullivan Bluth Studios?

Context paragraphs:
An American Tail: An American Tail is a 1986 American animated musical adventure family comedy-drama film directed by Don Bluth and produced by Sullivan Bluth Studios and Amblin Entertainment.  It tells the story of Fievel Mousekewitz and his family as they emigrate from Russian Empire-controlled territory of Ukraine to the United States for freedom.  However, he gets lost and must find a way to reunite with them.  It was released on November 21, 1986, to reviews that ranged from positive to mixed and was a box office hit, making it the highest-grossing non-Disney animated film at the time.  The success of it, "The Land Before Time", and Disney's "Who Framed Roger Rabbit", as well as Bluth's departure from their partnership, prompted Steven Spielberg to establish his own animation studio, Amblimation.

Morris Sullivan: Morris Francis Sullivan (December 8, 1916 – August 24, 2008) was an American businessman who co-founded the Sullivan Bluth Studios with three former Disney animators.  Sullivan Bluth Studios employed approximately 400 people at the peak of its success.  Under Sullivan's direction, the former animation studio created such films as "The Land Before Time" and "An American Tail".

John Pomeroy: John Foster Pomeroy (born March 26, 1951) is an American animator who has worked for several major studios, including The Walt Disney Company and Sullivan Bluth Studios.  He has also worked as producer, and screenwriter on several animated feature films.

Banjo the Woodpile Cat: Banjo the Woodpile Cat is a 1979 animated short film directed by Don Bluth.  It follows the story of Banjo, an overly curious and rebellious kitten who, after getting into trouble for falling from a house to see if he could land on his feet, runs away from his woodpile home in his owners' farm in Payson, Utah by catching a truck to Salt Lake City.  Produced in a shoestring budget, and created in Bluth's garage, the film took four years to make and it was the first production of Don Bluth Productions, later Sullivan Bluth Studios.  It had a short theatrical run from December 21 to 28, 1979 at the Egyptian Theatre in Hollywood and the Peppertree Cinema in Northridge as an opening short for the holiday re-release of "The Muppet Movie", but did not appear on network television until 1982.

Gary Goldman: Gary Wayne Goldman (born November 17, 1944) is an American film producer, director, animator, writer and voice actor, he is well known for working on films with Don Bluth such as "Anastasia", "An American Tail", and "The Land Before Time".  He was an animator at Disney before working at Sullivan Bluth Studios with Bluth.

Jesper Møller: Jesper Moller (Danish: "Møller") is a Danish Animator, Screenwriter and Movie-director.  Since beginning his career in animation and the movies in the late 1980s, Jesper Moller has participated in creating a vast number of Danish, European and American animated feature films (see below).  After initially working as character animator at Sullivan Bluth Studios under the direction of animation legend Don Bluth, he joined Danish animation studio A. Film A/S in Copenhagen, Denmark.  Amassing credits as directing animator, storyboard artist and character designer, he went on to become a central key in establishing A. Film A/S as Europe’s leading feature animation studio and a household name at the majors in the US.  After a period as the creative head of Feature Animation, also acting as sequence director on several films, he went on to co-direct (with Stefan Fjeldmark) the 2006 cinema hit Asterix and the Vikings, based on R. Goscinny and A. Uderzo's legendary comic book.

Rock-a-Doodle: Rock-a-Doodle is a 1991 live action/animated musical comedy film loosely based on Edmond Rostand's comedy "Chantecler".  Directed by Don Bluth and written by David N. Weiss, "Rock-a-Doodle" is an Irish, British and American venture produced by Sullivan Bluth Studios and Goldcrest Films.  The film features the voices of Glen Campbell, Christopher Plummer, Phil Harris (in his final role before his retirement and death), Charles Nelson Reilly, Sorrell Booke, Sandy Duncan, Eddie Deezen, Ellen Greene and Toby Scott Ganger in his film debut.  The film was released in the United Kingdom on 2 August 1991, and in the United States on 3 April 1992.

Sullivan Bluth Studios: Sullivan Bluth Studios was an American and Irish animated film production company established in 1979 by animator Don Bluth.  Bluth and several colleagues, all of whom were former Disney animators, left Disney in 1979 to form Don Bluth Productions, later known as the Bluth Group.  This studio produced the short film "Banjo the Woodpile Cat", the feature film "The Secret of NIMH", a brief animation sequence in the musical "Xanadu", and the video games "Dragon's Lair" and "Space Ace".  The Bluth Group went bankrupt in 1984, and Bluth co-founded Sullivan Bluth Studios with American businessman Morris Sullivan in 1985.

Don Bluth: Donald Virgil "Don" Bluth (born September 13, 1937) is an American animator, film director, producer, writer, production designer, video game designer and animation instructor.  He is known for directing animated films, such as "The Secret of NIMH" (1982), "An American Tail" (1986), "The Land Before Time" (1988), "All Dogs Go to Heaven" (1989) and "Anastasia" (1997), and for his involvement in the LaserDisc game "Dragon's Lair" (1983).  He is also known for competing with former employer Walt Disney Productions during the years leading up to the films that would make up the Disney Renaissance.  He is the older brother of illustrator Toby Bluth.

Dan Kuenster: Dan Kuenster (born December 29, 1955 in Chicago, Illinois) is an American character animator and director, who worked for Walt Disney Animation Studios and Sullivan Bluth Studios, before pursuing educational multimedia projects.  He is currently Executive Vice President of Design and Animation at Istation in Dallas, Texas.

Supporting paragraphs: Sullivan Bluth Studios Don Bluth
Answer: American