Question: What nationality was the animator that worked on the 15th Disney animated feature film?

Context paragraphs:
Home on the Range (2004 film): Home on the Range is a 2004 American animated musical western comedy film produced by Walt Disney Feature Animation and released by Walt Disney Pictures.  The 45th Disney animated feature film, it was the last 2D animated Disney film released until "The Princess and the Frog" in 2009.  Named after the popular country song of the same name, "Home on the Range" features the voices of Roseanne Barr, Judi Dench, Jennifer Tilly, Cuba Gooding Jr., Randy Quaid, and Steve Buscemi.  The film is set in the Old West, and centers on a mismatched trio of dairy cows—brash, adventurous Maggie; prim, proper Mrs. Caloway; and ditzy, happy-go-lucky Grace.  The three cows must capture an infamous cattle rustler named Alameda Slim for his bounty in order to save their idyllic farm from foreclosure.  Aiding them in their quest is Lucky Jack, a feisty, peg-legged rabbit, but a selfish horse named Buck, eagerly working in the service of Rico, a famous bounty hunter, seeks the glory for himself.

Peter Pan (1953 film): Peter Pan is a 1953 American animated adventure film produced by Walt Disney and based on the play "Peter Pan, or The Boy Who Wouldn't Grow Up" by J. M. Barrie.  It is the 14th Disney animated feature film and was originally released on February 5, 1953, by RKO Radio Pictures.  "Peter Pan" is the final Disney animated feature released through RKO before Walt Disney's founding of his own distribution company, Buena Vista Distribution, later in 1953 after the film was released.  "Peter Pan" is also the final Disney film in which all nine members of Disney's Nine Old Men worked together as directing animators.  It is also the second Disney animated film starring Kathryn Beaumont, Heather Angel, and Bill Thompson after their roles in the animated feature "Alice in Wonderland".

Tarzan (1999 film): Tarzan is a 1999 American animated drama adventure film produced by Walt Disney Feature Animation for Walt Disney Pictures.  The 37th Disney animated feature film and the last film produced during the Disney Renaissance era, it is based on the story "Tarzan of the Apes" by Edgar Rice Burroughs, and is the first animated major motion picture version of the "Tarzan" story.  Directed by Chris Buck and Kevin Lima with a screenplay by Tab Murphy, Bob Tzudiker, and Noni White, "Tarzan" features the voices of Tony Goldwyn, Minnie Driver, Glenn Close, and Rosie O'Donnell with Brian Blessed, Lance Henriksen, Wayne Knight, and Nigel Hawthorne.

The Sword in the Stone (film): The Sword in the Stone is a 1963 American animated musical fantasy comedy film produced by Walt Disney and released by Buena Vista Distribution.  The 18th Disney animated feature film, it was the final Disney animated film to be released before Walt Disney's death.  The songs in the film were written and composed by the Sherman Brothers, who later wrote music for other Disney films like "Mary Poppins" (1964), "The Jungle Book" (1967), "The Aristocats" (1970), and "Bedknobs and Broomsticks" (1971).

Hercules (1997 film): Hercules is a 1997 American animated musical fantasy comedy film produced by Walt Disney Feature Animation for Walt Disney Pictures.  The 35th Disney animated feature film, the film was directed by Ron Clements and John Musker.  The film is loosely based on the legendary hero Heracles (known in the film by his Roman name, Hercules), the son of Zeus, in Greek mythology.  The film also featured the first positive portrayal of African American women in a Disney animated film.

Dinosaur (film): Dinosaur is a 2000 American CGI animated adventure film produced by Walt Disney Feature Animation and The Secret Lab and released by Walt Disney Pictures.  It is the 39th Disney animated feature film and Disney's The Secret Lab computer animated feature, though it is not officially labeled as one of the animated classics in the United Kingdom, where "The Wild" (2006) is included in the canon instead.

Gary Mooney: Gary Mooney (1930 – August 5, 2008) was an American animator who worked for Walt Disney Studios, Hubley Studios and fellow animator Jay Ward during his career, which spanned several decades from the 1950s to the 2000s (decade).  Some of the most famous projects in which Mooney participated in included Disney's "Sleeping Beauty", "Lady and the Tramp" and Ward's "George of the Jungle".  He also worked on several live action films.  Mooney also completed many animated sequences, title sequences and graphics for use in live action films, television shows and commercials.

Lady and the Tramp: Lady and the Tramp is a 1955 American animated romantic musical comedy-drama film produced by Walt Disney and released to theaters on June 22, 1955 by Buena Vista Distribution.  The 15th Disney animated feature film, it was the first animated feature filmed in the CinemaScope widescreen film process.  Based on "Happy Dan, The Whistling Dog" by Ward Greene, "Lady and the Tramp" tells the story of a female American Cocker Spaniel named Lady who lives with a refined, upper-middle-class family, and a male stray mongrel called the Tramp.  When the two dogs meet, they embark on many romantic adventures.  A direct-to-video sequel, "", was released in 2001.

Fantasia 2000: Fantasia 2000 is a 1999 American animated film by Walt Disney Feature Animation and Walt Disney Pictures, and released by Buena Vista Pictures.  Produced by Roy E. Disney and Donald W. Ernst, it is the 38th Disney animated feature film and the sequel to "Fantasia" (1940).  Like its predecessor, "Fantasia 2000" consists of animated segments set to pieces of classical music.  Celebrities including Steve Martin, Itzhak Perlman, Quincy Jones, Bette Midler, James Earl Jones, Penn & Teller, and Angela Lansbury introduce each segment in live action scenes directed by Don Hahn.

The Rescuers Down Under: The Rescuers Down Under is a 1990 American animated comedy-drama adventure film produced by Walt Disney Feature Animation and released by Walt Disney Pictures on November 16, 1990.  The 29th Disney animated feature film, the film is the sequel to the 1977 animated film "The Rescuers", which was based on the novels of Margery Sharp.  Set in the Australian Outback, the film centers on Bernard and Bianca traveling to Australia to save a boy named Cody from a villainous poacher in pursuit of an endangered bird of prey.

Supporting paragraphs: Gary Mooney Lady and the Tramp
Answer: American